One used to be told as a child “Think what you’re saying.” Apparently we need also to be told “Think what you’re thinking.” The stakes have to be raised before we take the game quite seriously. I know this is the opposite of what is often said about the necessity of keeping all emotion out of our intellectual processes – “You can’t think straight unless you’re cool.” But then neither can you think deep if you are. I suppose one must try every problem in both states. You remember that the ancient Persians debated everything twice; once when they were drunk and once when they were sober.
– CS Lewis