Most men go through life unchallenged, except at the final moment.
That path leads ever down into stagnation.
Education is no substitute for intelligence.
Fear is the mind-killer.
One of the best things to come out of the home computer revolution could be the general and widespread understanding of how severely limited logic really is.
Irreverence is a most necessary ingredient of religion. Not to speak of its importance in philosophy. Irreverence is the only way left to us for testing our universe.