The difference between a lair and a fool is that the liar knows that they are lying; the fool believes the lie. Liars most often make fools of themselves. To be a liar, one must not only remember their lie, they must also remember that they are lying. That's not easy to do, and that's why we have so many more fools in the world than liars. Liars most often make fools out of themselves because of how very little we remember. We remember a vanishingly insignificant percentage of all of the thoughts, and feelings, and choices, out of every hour of every day of our lives, but we have to remember our lies. Consequently, the longer one remembers a lie, the more often one retells a lie, the more adamantly one defends a lie, the more likely that one is to forget the truth and have the lie supplant the memory. At the very moment the liar forgets that he is lying, he stops being a liar and becomes a fool.