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Argument From Personal Incredulity Fallacy

Updated Feb 10, 2023

The Argument from Personal Incredulity Fallacy: Understanding the Pitfalls of Ignorance


In the realm of logical reasoning and critical thinking, fallacies often serve as stumbling blocks, hindering us from reaching sound conclusions. One such fallacy is the argument from personal incredulity. This fallacy occurs when someone rejects a claim or argument simply because they personally find it difficult to believe or understand. In this article, we will delve deeper into this fallacy, explore its implications, and provide examples to help you identify and avoid it.

What is the Argument from Personal Incredulity Fallacy?

At its core, the argument from personal incredulity fallacy undermines the logical process by substituting subjective disbelief or lack of understanding for objective evidence or rational argumentation. In simpler terms, it occurs when an individual concludes that a statement or proposition is false or invalid based solely on their personal inability to comprehend it or accept it as true.

Unraveling the Fallacy

The Pitfalls of Subjective Belief

One of the primary dangers of the argument from personal incredulity is that it relies heavily on subjective beliefs or personal experiences, rather than objective evidence. Just because something appears implausible or counterintuitive to us, does not necessarily make it false. Our personal understanding of the world is limited, and it is crucial to recognize that our lack of belief or understanding does not invalidate an argument or claim.

Ignorance is Not Evidence

The argument from personal incredulity often stems from a lack of knowledge or understanding regarding a particular subject. However, it is important to remember that ignorance is not a substitute for evidence or an argument. Instead of dismissing a claim based on personal ignorance, it is more intellectually honest to investigate further, gather more information, and seek out valid evidence before drawing a conclusion.

The Fallacy in Action

To better understand this fallacy, let's consider an example. Suppose a person claims that extraterrestrial life exists in the vast universe due to the sheer number of planets and galaxies. Another individual, encountering this claim, might respond with, "I find it hard to believe in aliens, so they must not exist." This response exemplifies the argument from personal incredulity fallacy, as it dismisses the claim solely based on personal disbelief, without considering any evidence or logical reasoning.

Avoiding the Argument from Personal Incredulity

Recognizing and avoiding the argument from personal incredulity fallacy is essential for fostering rational and logical thinking. Here are a few tips to help you navigate this fallacy:

1. Embrace Humility

Accept that personal understanding and beliefs are subjective and may not always align with objective reality. Cultivating a sense of humility allows for open-mindedness and the willingness to explore new ideas, even if they initially seem implausible.

2. Seek Knowledge and Evidence

When faced with a claim or argument that goes against your intuition, take the initiative to seek out knowledge and evidence. Engage in research, consult reputable sources, and gather information that supports or challenges the claim before drawing any conclusions.

3. Consult Experts

If a subject matter is outside your area of expertise, don't hesitate to consult professionals or experts in the field. Their knowledge and insights can help broaden your understanding and provide a more informed perspective.

4. Engage in Critical Thinking

Developing critical thinking skills is crucial to avoid fallacious reasoning. Question assumptions, challenge your own beliefs, and analyze arguments for their logical validity, rather than relying solely on personal incredulity.


The argument from personal incredulity fallacy is a common pitfall in logical reasoning, hindering us from reaching rational conclusions. By recognizing the limitations of our personal beliefs and understanding, embracing humility, seeking knowledge, and engaging in critical thinking, we can avoid this fallacy and foster a more intellectually honest approach to evaluating claims and arguments. Remember, dismissing something purely because we find it hard to believe or understand is not a valid basis for logical reasoning. Let's strive to overcome this fallacy and embrace a more nuanced and evidence-based approach to thinking.

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