Wittgenstein, in a letter to a friend

"Whenever I thought of you I couldn't help thinking of a particular incident which seemed to me very important ... you made a remark about 'national character' that shocked me by its primitiveness. I then thought: what is the use of studying philosophy if all that it does for you is to enable you to talk with some plausibility about some abstruse questions of logic, etc., & if it does not improve your thinking about the important questions of everyday life, if it does not make you more conscientious than any ... journalist in the use of the dangerous phrases such people use for their own ends. You see, I know that it's difficult to think well about 'certainty, 'probability', 'perception', etc. But it is, if possible, still more difficult to think, or try to think, really honestly about your life & other people's lives. And the trouble is that thinking about these things is not thrilling, but often downright nasty. And when it's nasty then it's most important."