I believe that a man can only be useful to his country when he can look at it clearly. — Adam Michnik
For clearly it is impossible to touch eternity with one hand and life with the other. — Yukio Mishima
This notion [skepticism] is more clearly understood by asking “What do I know?” — Michel de Montaigne
If you cannot state a proposition clearly and unambiguously, you do not understand it. — Milton Friedman