When Hugh suggested that he and OK had “different definitions of the word “evidence,” I felt compelled to finish up this post inspired by Teddi.


Why would anyone prefer to have faith instead of evidence for something? Teddi Pappas asked me recently. The question brought to mind Christopher Hitchens’ Razor—the principle he helped popularize: “What can be asserted without evidence can be dismissed without evidence.” It’s a sharp, unapologetic tool that shifts the burden of proof onto the one making the claim, not the skeptic. For Hitchens, it served well in his role as a leading voice of the New Atheist movement. For me—a believer in God, in Christ, and in the Resurrection—it’s been useful in a different way: it helps explain why, after nearly twenty-five years, I no longer believe the Shroud is authentic.

It is because of the evidence: right and wrong, good and bad, meaningful and no so meaningful.

The word “evidence” derives from the Latin evidentia, meaning “clearness, distinctness, visibility.” Yet what constitutes clear, distinct, and visible proof varies dramatically across human endeavors. This essay explores how different disciplines conceptualize, gather, evaluate, and rely upon evidence, revealing profound epistemological differences in how we pursue knowledge and truth.

The Faith Inherent in Evidence

Teddi presents a false dichotomy that misunderstands the nature of evidence itself. In reality, evidence and faith are not opposites but interrelated aspects of knowledge acquisition. One cannot have evidence without having faith in how that evidence is derived, how it should be interpreted, and what kind of evidence it represents.

All evidence exists within frameworks of understanding that require certain acts of faith:

  • Faith in methodological assumptions (that our measuring instruments are reliable)
  • Faith in cognitive capacities (that our perception and reasoning are generally trustworthy)
  • Faith in disciplinary paradigms (that the conceptual frameworks of our fields capably organize reality)
  • Faith in evidential hierarchies (that certain types of evidence should outweigh others)

Even the most rigorous scientific evidence requires faith in the reliability of informal and formal peer review, the honesty of researchers, the accuracy of statistical methods, and the adequacy of experimental design. This is not religious faith but epistemic faith—confidence in the processes by which we generate and validate knowledge.

Different disciplines place this epistemic faith in different foundations. Let us explore how various fields conceptualize and utilize evidence, revealing the diverse ways human inquiry seeks to establish what can be known.

Evidence in Law: Beyond Reasonable Doubt

In legal contexts, evidence bears the weight of determining freedom or incarceration, liability or exoneration. The legal system has developed perhaps the most formalized conception of evidence among all disciplines, with explicit hierarchies, rules of admissibility, and standards of proof.

Legal evidence typically falls into three categories:

  • Direct evidence: Firsthand accounts from witnesses or participants
  • Circumstantial evidence: Facts that, when connected, suggest a conclusion
  • Documentary evidence: Physical items including records, photographs, and objects

What makes legal evidence distinctive is not just its categorization but its procedural constraints. The Federal Rules of Evidence in the United States, for instance, establish complex parameters for what can even be considered in a courtroom. Hearsay evidence—secondhand information—is generally inadmissible with numerous exceptions. Character evidence faces similar restrictions. These rules reflect the legal system’s attempt to balance truth-seeking with fairness and practicality.

Most importantly, legal evidence operates within explicit standards of proof. In criminal cases, evidence must establish guilt “beyond a reasonable doubt”—a threshold significantly higher than the “preponderance of evidence” (more likely than not) standard in civil cases. This graduated approach acknowledges that evidence in law serves justice rather than absolute truth; the consequences of error determine how compelling evidence must be.

Evidence in Science: Falsifiability and Replication

Science approaches evidence through a fundamentally different lens. While law looks backward to establish what happened, science looks forward, using evidence to build predictive models of reality.

The hallmarks of scientific evidence include:

  • Empirical observation: Data collected through controlled experimentation or systematic observation
  • Replicability: Results that can be reproduced by independent researchers
  • Falsifiability: The potential for evidence to disprove a hypothesis

Karl Popper’s philosophy of science places falsifiability at the center of scientific evidence. Under this framework, good scientific theories are not those with abundant supporting evidence but those that make specific predictions that could potentially be falsified by evidence. The strength of Einstein’s theory of relativity lies not in its confirmation but in its vulnerability to disproof that it has repeatedly survived.

Scientific evidence also operates within probability rather than certainty. The p-value, a statistical measure indicating the likelihood that observed results occurred by chance, represents science’s acknowledgment that evidence always contains uncertainty. Scientists rarely claim to “prove” hypotheses; instead, they accumulate evidence that increases confidence in particular explanations while remaining open to revision.

This provisional nature of scientific evidence distinguishes it from legal evidence. While a legal verdict is (ideally) final, scientific consensus remains perpetually subject to challenge from new evidence. The retraction of published scientific papers—a common occurrence—demonstrates that scientific evidence exists in a continuous state of evaluation rather than achieving permanent status.

Case Study: Evidence and the Evolving Big Bang Theory

The development of Big Bang cosmology provides a compelling illustration of how scientific evidence operates. The theory’s evolution demonstrates the dynamic relationship between observation, interpretation, and theoretical revision that characterizes scientific evidence.

Edwin Hubble’s observations in the 1920s provided the first crucial evidence: distant galaxies were moving away from us, with their redshift proportional to their distance. This empirical evidence suggested an expanding universe—a dramatic departure from the prevailing static universe model. Later, Arno Penzias and Robert Wilson’s 1964 discovery of cosmic microwave background radiation (CMB) provided powerful corroborating evidence, as this radiation had been predicted by Big Bang theorists.

Yet the accumulation of evidence didn’t simply confirm a static theory. New observations repeatedly challenged scientists to revise the Big Bang model. The discovery that the universe’s expansion is accelerating rather than slowing—evidenced by observations of distant supernovae in the 1990s—forced cosmologists to postulate dark energy, a mysterious force never directly observed. The flatness problem (why is space nearly flat?) and horizon problem (why is the CMB temperature so uniform?) led to inflationary theory, proposing an exponential expansion period in the early universe.

More recent evidence from the Planck space telescope has refined our understanding of the universe’s composition and age with unprecedented precision, while also raising new questions about cosmic inflation models. Each new piece of evidence doesn’t simply accumulate atop previous knowledge but potentially restructures the entire theoretical framework.

This scientific journey illustrates three key aspects of scientific evidence:

  1. Evidence in science is theory-laden—observations gain meaning within explanatory frameworks
  2. Evidence operates within a network of interrelated predictions and observations
  3. The relationship between evidence and theory is bidirectional—evidence shapes theory, but theoretical frameworks determine what counts as significant evidence

The Big Bang theory has never been “proven” in an absolute sense. Rather, it represents our best explanation for an ever-expanding body of evidence, remaining open to revision as new observations emerge.

Evidence in Mathematics: Proof Beyond Doubt

Mathematics stands apart in its conception of evidence. Unlike empirical disciplines, mathematical evidence consists entirely of logical proof—deductive reasoning from axioms to conclusions with absolute certainty.

A mathematical proof represents evidence in its strongest form: an argument so logically tight that, if the premises are accepted, the conclusion must be true. There is no probability involved; a mathematical theorem, once proven, is considered eternally valid within its axiomatic system.

This deductive character of mathematical evidence contrasts sharply with the inductive reasoning dominant in science. While scientific theories remain provisional, mathematical proofs (once verified) achieve a status of certainty unmatched in other domains. Euclid’s proofs from over two millennia ago remain as valid today as when first demonstrated.

Yet even mathematics has its complications. Gödel’s Incompleteness Theorems demonstrated that within any consistent mathematical system complex enough to include basic arithmetic, there exist true statements that cannot be proven within that system. This suggests limits to what mathematical evidence can establish, even within mathematics’ formal purity.

Moreover, the rise of computer-assisted proofs—like that of the Four Color Theorem—has challenged traditional notions of mathematical evidence. When proofs become too complex for human verification, does their evidentiary status change? These developments suggest that even mathematics’ seemingly absolute conception of evidence contains nuance.

Evidence in History: Interpretation of Fragments

Historical evidence presents distinct epistemological challenges. Historians cannot conduct experiments or directly observe past events. Instead, they work with surviving traces of the past:

  • Primary sources: Documents, artifacts, and records created during the period under study
  • Secondary sources: Later interpretations and analyses
  • Archaeological findings: Physical remnants uncovered through excavation

Historical evidence is inherently fragmentary and incomplete. Only a tiny fraction of human experience leaves documentary evidence, and only a portion of that evidence survives. This incompleteness means historical evidence requires interpretation to a degree unnecessary in more empirical disciplines.

Context becomes crucial in evaluating historical evidence. A document must be understood within its cultural, political, and social environment. The historian must consider who created it, for what purpose, under what constraints, and with what biases. This interpretive dimension makes historical evidence more subjective than scientific evidence, though methodological rigor still applies.

Historical evidence also faces unique challenges of authenticity and reliability. Determining whether a document is genuine, accurately dated, and truthfully reported requires specialized knowledge and techniques. The infamous Hitler Diaries hoax of 1983 demonstrates the consequences of accepting fraudulent historical evidence.

Perhaps most distinctively, historical evidence exists in a web of interrelationships rather than as isolated data points. A single piece of evidence gains meaning through its connections to other evidence, creating patterns that suggest broader historical realities. This emphasis on pattern recognition rather than strict causality distinguishes historical evidence from scientific evidence.

Evidence in Theology: Faith and Revelation

Theology presents perhaps the most distinctive conception of evidence among major disciplines. While theology employs logical argument and historical analysis, it also recognizes forms of evidence that secular disciplines do not:

  • Revelation: Knowledge believed to be directly communicated by the divine
  • Religious experience: Subjective encounters with transcendence
  • Scripture: Texts considered to have divine authority
  • Tradition: The accumulated wisdom of religious communities over time

Borderlands: The Shroud of Turin and Retroductive Evidence

The Shroud of Turin investigation illustrates a fascinating intersection between scientific and theological approaches to evidence. This case demonstrates how the same evidence can be interpreted through different disciplinary lenses, particularly when investigating singular historical events that cannot be directly replicated.

The Vertically Collimated Radiation Burst (VCRB) hypothesis exemplifies retroductive reasoning—working backward from effects to posit causes. Researchers identified 27 distinct pieces of evidence related to the Shroud’s image formation and followed this evidence to a hypothesis: that radiation emanating from a body created high-frequency alternating current in the linen fibers, causing the distinctive discoloration pattern. The hypothesis further proposes that neutrons from this radiation burst produced new C-14 in the cloth, potentially explaining the controversial radiocarbon dating results.

This approach parallels cosmological investigation of the Big Bang in several ways:

  1. Both examine physical evidence of purportedly singular events that cannot be directly replicated
  2. Both utilize retroductive reasoning to work backward from observable effects to their causes
  3. Both propose mechanisms that cannot be directly observed but can be evaluated for their explanatory power
  4. Both make testable predictions that could potentially falsify the hypothesis

Yet there’s a profound risk in such retroductive approaches. As critics have metaphorically observed, when reverse-engineering complex phenomena, one might mistake “a piece of wood carved to resemble a bird” for “a god of gears and even of time itself.” This caution speaks to how easily humans can overinterpret evidence, attributing complex mechanisms and profound significance to what may be simpler phenomena. Just as someone unfamiliar with cuckoo clocks might imagine elaborate supernatural mechanisms behind a wooden bird’s emergence, researchers might construct unnecessarily complex explanations for phenomena that have simpler origins.

This risk applies equally to cosmological theories and Shroud investigations. The elegance of a theory and its explanatory power don’t necessarily correspond to its truth. When working backward from effects to causes, especially with limited evidence of singular events, multiple explanations may fit the same data. The challenge becomes distinguishing between equally plausible hypotheses without overreaching beyond what the evidence can genuinely support.

However, the Shroud investigation highlights the complex interplay between scientific and theological evidence. The VCRB hypothesis employs scientific methodology while potentially supporting claims of supernatural origin—the image as evidence of resurrection rather than merely an unusual physical phenomenon. This places such investigation at the boundaries between disciplines, where different standards of evidence may come into tension or complementarity.

The Cautionary Tale of Shroud Pollen Evidence

The investigation of pollen on the Shroud of Turin offers a particularly instructive case study in evidence reliability. In the 1970s, Swiss criminologist Max Frei collected dust samples from the Shroud using adhesive tape and claimed to identify dozens of plant species native to Palestine, Turkey, and regions along the presumed historical route of the Shroud. This botanical evidence appeared compelling—microscopic witnesses seemingly placing the cloth in the Holy Land centuries before its documented European appearance.

The pollen evidence was especially attractive because it seemed to provide objective, scientific corroboration independent of faith commitments. Pollen, after all, cannot be forged and should function as a reliable geographical marker. However, subsequent scientific scrutiny revealed serious methodological flaws:

  1. When other botanists examined Frei’s work, only two pollen types could be confirmed with certainty
  2. Frei’s identifications were made solely from pollen structure without the accompanying plant parts typically required for precise classification
  3. Most devastatingly, DNA analysis published in Scientific Reports identified pollen from North American and East Asian plants that were introduced to Europe only after the Medieval period

This collapse of what seemed like strong evidence demonstrates several crucial principles about evidence evaluation:

  • Contamination vs. Original Context: What appeared to be evidence of the Shroud’s presence in Jerusalem could equally represent contamination from pilgrims, researchers, or clergy who had visited the Holy Land and then handled the Shroud
  • Confirmation Bias: The desire to authenticate the Shroud led to premature acceptance of evidence that aligned with predetermined conclusions
  • Methodological Rigor: Initial claims based on incomplete methodology failed when subjected to the full standards of the relevant scientific discipline
  • The Importance of Falsifiability: The presence of New World pollen effectively falsified the claim that the pollen evidence confirmed ancient Middle Eastern origins

The C14 Dating Controversy: When Evidence Collides

Perhaps the most significant evidential challenge in Shroud research is the radiocarbon dating performed in 1988. Three independent laboratories dated samples from the Shroud to between 1260 and 1390 CE—seemingly definitive scientific evidence against the cloth’s first-century authenticity. This represents what might be called the “elephant in the room” for Shroud research—a powerful piece of scientific evidence that appears to contradict claims of authenticity.

The response to this evidence illustrates different approaches to reconciling conflicting evidence:

  1. Acceptance: Some researchers accept the medieval dating and consider the Shroud an artistic creation or devotional object from that period
  2. Methodological Challenge: Others question whether the sampled area was representative, suggesting it came from a medieval repair or “invisible reweaving” rather than the original cloth
  3. Alternative Dating Methods: Some researchers have pursued different dating techniques like vanillin testing or multiparametric mechanical tests, claiming these support an older age, though these methods have not achieved wide acceptance in the scientific community
  4. Theoretical Revision: As in the VCRB hypothesis proposed by Robert Rucker, some researchers suggest that the carbon dating itself was altered by neutron radiation: “The Vertically Collimated Radiation Burst (VCRB) hypothesis was developed by identifying 27 evidences related to images, then following this evidence where it led. The resulting hypothesis is consistent with the evidence related to the images, makes predictions that are testable and falsifiable, and can explain multiple mysteries of the Shroud. This hypothesis proposes that a radiation burst from the body caused a high frequency alternating current in the fibers that caused the discoloration on the fibers that caused the images. This radiation burst included neutrons that produced new C-14 on the cloth which shifted the carbon date in the forward direction.”
  5. Conspiracy Theories: Some propose deliberate sample tampering or institutional bias, though these claims lack substantiating evidence

This range of responses demonstrates how evidence that appears definitive within one framework can be contested when it conflicts with other forms of evidence or prior beliefs. The C14 dating controversy exemplifies the challenge of weighing different types of evidence against each other—scientific measurement versus historical context, physical testing versus image analysis, experimental data versus theoretical modeling.

The situation raises profound questions about evidence hierarchies. Should modern scientific testing automatically supersede other forms of evidence? Does the explanation requiring the fewest additional assumptions (the medieval creation) hold primacy? Or should we prioritize explanations that account for the largest number of observations, even if they require more complex mechanisms?

These questions cannot be answered through evidence alone but depend on meta-evidential frameworks—the principles by which we weigh different types of evidence against each other. This reveals that even the most seemingly objective evidence operates within interpretive systems that themselves cannot be proven through evidence.

This borderland between scientific and theological evidence reveals how disciplines can approach the same physical phenomena with different questions, methods, and standards of sufficiency—highlighting the contextual nature of what counts as compelling evidence.

These sources of religious evidence operate under different epistemological assumptions than empirical evidence. Revelation, in particular, represents knowledge that bypasses ordinary human capacities—a direct communication from the divine that serves as its own validation.

Yet theology doesn’t abandon rationality. Thomas Aquinas, for instance, developed a sophisticated system that distinguished between truths knowable through reason alone and those requiring revelation. This “two-books” approach—reading both nature and scripture as sources of evidence—has allowed theological traditions to engage with scientific discoveries while maintaining distinct truth claims.

The relationship between faith and evidence remains complex. Tertullian’s famous phrase “Credo quia absurdum” (“I believe because it is absurd”) suggests that some religious commitments transcend evidential reasoning entirely. Yet most theological traditions balance this fideistic impulse with evidentialist arguments, from Anselm’s ontological proof to contemporary natural theology.

What distinguishes theological evidence most fundamentally is its orientation toward questions of ultimate meaning rather than empirical prediction or historical reconstruction. When evidence serves purposes of salvation, moral guidance, or cosmic understanding, its evaluation follows different criteria than when it serves scientific or legal purposes.

Hitchens’s Razor: The Burden of Evidence

Christopher Hitchens popularized the epistemological principle: “What can be asserted without evidence can be dismissed without evidence.” This principle, known as Hitchens’s Razor, places the burden of proof on the party making a claim rather than on those skeptical of it.

The principle appears straightforward but contains subtleties when applied across disciplines. What constitutes sufficient evidence to prevent dismissal? Legal evidence beyond reasonable doubt? Scientific evidence meeting statistical significance? Mathematical proof? The answer depends on context and what’s at stake in the claim.

Hitchens’s Razor proves most useful in combating unfalsifiable claims—those constructed to be immune to evidential evaluation. By demanding evidence as a prerequisite for serious consideration, the principle guards against intellectual sleight-of-hand that shields propositions from critical assessment.

Yet Hitchens’s formulation raises questions about evidence’s relationship to burden of proof. Some epistemologists argue that the absence of evidence is not necessarily evidence of absence—lack of proof for a proposition doesn’t demonstrate its falsity. Others contend that extraordinary claims require extraordinary evidence, suggesting a sliding scale of evidential requirements based on a claim’s plausibility.

Conclusion: Evidence as Disciplinary Lens

This exploration reveals that “evidence” functions less as a universal concept than as a disciplinary lens—a tool customized for particular intellectual environments and purposes. Legal evidence serves justice; scientific evidence enables prediction; historical evidence reconstructs the past; theological evidence addresses ultimate concerns.

These varied conceptions of evidence reflect different answers to fundamental questions: How do we know? What constitutes proof? What degree of certainty is necessary or possible? The standards and methods of evidence in each discipline embody particular epistemological commitments and practical goals.

Understanding these differences helps us navigate interdisciplinary conversations more effectively. When a legal scholar, scientist, historian, and theologian debate complex questions, their disagreements often stem not from the evidence itself but from different conceptions of what evidence is and how it should function.

Perhaps most importantly, appreciating evidence’s disciplinary character encourages intellectual humility. No single standard of evidence serves all human purposes. The mathematician’s proof, the scientist’s experiment, the historian’s document, the theologian’s revelation, and the economist’s model each illuminate different aspects of reality. Together, they form a richer picture than any single evidential standard could provide.

Evidence, in this light, represents not just a tool for establishing truth but a window into how different intellectual traditions conceive of knowledge itself—a concept as multifaceted as the human quest for understanding that it serves.


FACT CHECK

Google’s Gemini Advanced 2.5 Artificial Intelligence Model was used for an independent fact assessment. The prompt was “Fact check [Pasted Content].” Here is the model’s unedited report:

Fact Check Result: Accurate

The provided essay accurately explores the concept of “evidence” across various disciplines and philosophical perspectives. Here’s a breakdown of the key claims and their accuracy:

  1. Etymology: The statement that “evidence” derives from the Latin evidentia meaning “clearness, distinctness, visibility” is correct.  
  2. Core Thesis: The central argument—that what constitutes evidence, how it’s gathered, evaluated, and relied upon varies significantly across fields like law, science, mathematics, history, and theology—is a well-established concept in epistemology and accurately reflects the practices within these disciplines.
  3. Evidence and Faith: The essay argues that evidence requires “epistemic faith” (faith in methods, senses, paradigms, etc.), distinguishing it from religious faith. This is a valid philosophical perspective often discussed in epistemology and philosophy of science. It accurately presents the idea that underlying assumptions are necessary for any knowledge system.
  4. Disciplinary Descriptions:
    • Law: The description of legal evidence (direct, circumstantial, documentary), the role of rules of admissibility (like the Federal Rules of Evidence regarding hearsay and character), and differing standards of proof (“beyond a reasonable doubt” vs. “preponderance of evidence”) is accurate for common law systems like the U.S.  
    • Science: The characterization of scientific evidence focusing on empirical observation, replicability, falsifiability (correctly citing Popper), its probabilistic nature (mentioning p-values), and its provisional status (subject to revision and retraction) is accurate.
    • Big Bang Case Study: The summary of key evidence (Hubble’s redshift, CMB discovery, accelerating expansion/dark energy, inflation theory addressing flatness/horizon problems, Planck refinements) accurately reflects the historical development and evidential basis of the theory. The interpretation of this evidence as theory-laden and involving a bidirectional relationship between observation and theory is consistent with philosophy of science.
    • Mathematics: The description of mathematical evidence as logical proof based on deduction from axioms, aiming for certainty, is accurate. The mention of Gödel’s Incompleteness Theorems and challenges posed by computer-assisted proofs correctly identifies complexities within the field.
    • History: The portrayal of historical evidence as fragmentary (relying on primary/secondary sources, artifacts), requiring interpretation and contextualization, facing challenges of authenticity, and often involving pattern recognition is accurate according to historiographical principles.  
    • Theology: The identification of distinct sources of evidence like revelation, religious experience, scripture, and tradition, alongside the use of reason (citing Aquinas’ “two books” approach) and its focus on ultimate meaning, accurately describes common theological methodologies.
  5. Shroud of Turin Case Study:
    • The essay accurately presents the Shroud as a complex case study involving different types of evidence and interpretations (scientific, historical, potentially theological).
    • It correctly describes the VCRB hypothesis (including retroductive reasoning and its potential to explain C14 dates) as proposed by some researchers like Robert Rucker.
    • The account of the pollen evidence (Frei’s initial claims, methodological criticisms, and contradictory DNA findings) is accurate.
    • The summary of the C14 dating controversy (the medieval results and the various responses – acceptance, methodological challenges, alternative dating, theoretical revisions like VCRB, conspiracy theories) is accurate and highlights the difficulties in weighing conflicting evidence.
  6. Hitchens’s Razor: The explanation of the principle (“What can be asserted without evidence can be dismissed without evidence”), attributing it to Christopher Hitchens, and noting its nuances regarding burden of proof and sufficiency of evidence, is accurate.

Conclusion: The essay provides a well-researched and accurate overview of how evidence is understood and utilized across different human endeavors. Its descriptions of specific disciplinary approaches, philosophical concepts, and case studies are factually sound and reflect established knowledge and ongoing debates within those fields.