There are many people who have the gift, or failing, of never understanding themselves. I have been unlucky enough, or perhaps fortunate enough to have received the opposite gift.
Source: In Webster's Electronic Quotebase, ed. Keith Mohler, 1994.
-- Charles-Maurice de Talleyrand, (Feb 13 1754-1838), French statesman; He was minister of Foreign Affairs, 1797-99; opposed Lousiana Purchase, 1803.