• Rebuttal: Evolutionary processes can favor true beliefs if they contribute to survival and reproductive success. For instance, accurately perceiving threats, resources, and social dynamics can directly enhance an organism’s chances of survival and reproduction.
  • Rebuttal: The reliability of our cognitive faculties can be high if true beliefs generally lead to better survival outcomes. Moreover, humans have developed methods (e.g., the scientific method) to systematically test and refine beliefs, increasing their reliability.
  • Rebuttal: This conclusion underestimates the extent to which reliable cognitive faculties can emerge from evolutionary processes. Furthermore, the use of critical thinking and scientific inquiry provides additional mechanisms to enhance the reliability of our cognitive faculties beyond mere evolutionary selection.
  • Rebuttal: This premise conflates natural causes with irrational causes. Natural processes can produce rational faculties capable of evaluating and refining beliefs based on evidence and logic.

Provide your own rebuttal to the following formulations of the argument that an evolutionary source of the human mind makes rationality impossible.

— 1. Alvin Plantinga

Premise 1: If both evolution and naturalism are true, our cognitive faculties are a product of evolution alone.

Premise 2: Evolution selects for survival and reproduction, not necessarily for the production of true beliefs.

Premise 3: If our cognitive faculties are selected for survival and reproduction, the probability of them being reliable is low.

Conclusion: Therefore, if both evolution and naturalism are true, the probability that our cognitive faculties are reliable is low, undermining rationality.

— 2. C.S. Lewis

Premise 1: If naturalism is true, then all beliefs are the result of irrational causes.

Premise 2: Rational thought requires beliefs to be the result of rational causes.

Premise 3: If all beliefs are the result of irrational causes, then rational thought is not possible.

Conclusion: Therefore, if naturalism is true, rational thought is not possible.

— 3. Thomas Nagel

Premise 1: Evolutionary theory explains the emergence of human cognition solely in terms of natural selection.

Premise 2: Natural selection explains traits that enhance survival and reproduction, not necessarily those that produce true beliefs.

Premise 3: The emergence of rationality and objective truth requires an explanation that accounts for the reliability of cognitive faculties.

Conclusion: Therefore, evolutionary theory alone is inadequate to fully explain the emergence of reliable rationality and objective truth.

— 4. John Gray

Premise 1: Human rationality is shaped by evolutionary forces that prioritize survival over truth.

Premise 2: If rationality is shaped by forces that prioritize survival over truth, it is contingent and flawed.

Premise 3: Belief in the unique rationality of humans is an illusion shaped by evolutionary survival strategies.

Conclusion: Therefore, human rationality is an illusion and cannot be trusted as a reliable reflection of objective reality.


Create an essay based on this content that rigorously defines relevant terms and that offers a step-by-step logical explanation why the position of the 4 philosophers is flawed.


Provide salient analogies that reflect the non-orthogonal relationship between survival and rationality.


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Phil Stilwell

Phil picked up a BA in Philosophy a couple of decades ago. After his MA in Education, he took a 23-year break from reality in Tokyo. He occasionally teaches philosophy and critical thinking courses in university and industry. He is joined here by ChatGPT 4, GEMINI, CLAUDE, and occasionally Copilot, his far more intelligent AI friends. The five of them discuss and debate a wide variety of philosophical topics I think you’ll enjoy.

Phil curates the content and guides the discussion, primarily through questions. At times there are disagreements, and you may find the banter interesting.

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