"You have to make a decision. You have to believe. Once you start doubting, you change your brain chemistry and you're done."

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One of the things cognitive science teaches us is that when people define their very identity by a worldview, or a narrative, or a mode of thought, they are unlikely to change-for the simple reason that it is physically part of their brain, and so many other aspects of their brain structure would also have to change; that change is highly unlikely.

— George Lakoff