[Heraclitus] did not require humans or their sort of knowledge, since everything into which one may inquire he despises [as being] in contrast [to his own] inward-turning wisdom. [To him] all learning from others is a sign of nonwisdom, because the wise man focuses his vision on his own intelligence.
I always check my harness before I do a stunt; I test-drive the cars I have to race or explode; I'm present at all pyrotechnical rehearsals; and I walk through everything step-by-step. No man should put their life in someone else's hands unless they have covered their own safety from all angles.
Whereas the man of action binds his life to reason and its concepts so that he will not be swept away and lost, the scientific investigator builds his hut right next to the tower of science so that he will be able to work on it and to find shelter for himself beneath those bulwarks which presently exist.
Man loves the marvelous. It has an irresistible charm for him. He is always ready to leave that with which he is familiar to pursue vain inventions. He lends himself to his own deception.
Men do not knowingly drink for the effect alcohol produces on the body. What they drink for is the brain-effect; and if it must come through the body, so much the worse for the body.
Man," said the Ghost, "if man you be in heart, not adamant, forbear that wicked cant until you have discovered What the surplus is, and Where it is. Will you decide what men shall live, what men shall die?
A man should demand much from himself, but little from others. When you meet a man of worth, think how you may attain to his excellence. When you meet an unworthy one, then look within and examine yourself.