Joan's decision to wear men's clothing was a profound theological transgression, explicitly condemned in the Book of Deuteronomy. She never justified it on practical grounds like safety, but as a direct command from her voices. This framed the act as one of religious obedience that paradoxically broke religious law, making it central to her heresy charge.

We confuse our capacity for innovation with wisdom, but we are not wise by default. The same mind that conceives of evolution can rationalize slavery, the Holocaust, and cruelty to animals. Our psychology is masterful at justification, making our default state far from conscious or wise.

People are often unaware of the ultimate evolutionary drivers for their actions, such as attraction or competition. Consciousness frequently develops post-hoc justifications, meaning individuals don't know the real 'why' behind their behavior and simply invent a plausible story.

Diarmaid MacCulloch argues that foundational historians of sexuality, including Michel Foucault, John Boswell, and Alan Bray, produced unreliable work. He posits their perspectives were distorted by their Roman Catholic backgrounds, leading to flawed theories like the 19th-century "invention" of homosexuality.

After contracting an STD from an actress, Boswell’s journal meticulously tracks his emotional journey from amorousness to guilt, then to righteous indignation. This provides a raw account of the psychological self-deception people use to preserve their self-image after acting poorly.

We operate with two belief modes. For our immediate lives, we demand factual truth. For abstract domains like mythology or ideology, we prioritize morally uplifting or dramatically compelling narratives over facts. The Enlightenment was a push to apply the first mode to everything.

To counteract the brain's tendency to preserve existing conclusions, Charles Darwin deliberately considered evidence that contradicted his hypotheses. He was most rigorous when he felt most confident in an idea—a powerful, counterintuitive method for maintaining objectivity and avoiding confirmation bias.

Humans hold conflicting beliefs simultaneously (e.g. "look before you leap" vs "he who hesitates is lost"). The one that dictates your action is chosen not by logic, but by your prevailing emotional state. This is why mastering your state is the primary step to change.

A thought becomes distressing and "ego-dystonic" when it fundamentally conflicts with a person's values and self-identity. The same thought (e.g., a blasphemous one) can be deeply disturbing to a religious person but meaningless to an atheist.