The first principle is that you must not fool yourself and you are the easiest person to fool.
Richard P. Feynman (2015). “The Quotable Feynman”, p.345, Princeton University Press
![The first principle is that you must not fool yourself and you are the easiest person to fool.](http://cdn.myquotes.org/images/richard-p-feynman/the-first-principle-is-that-you-must-not-fool-yourself-and-you-are-the-easiest-person-to-fool.jpg)
The first principle is that you must not fool yourself and you are the easiest person to fool.