The most important decision we make is whether we believe we live in a friendly or hostile universe.

I believe in standardizing automobiles, not human beings.

... it is a welcome symptom in an age which is commonly denounced as materialistic, that it makes heroes of men whose goals lie wholly in the intellectual and moral sphere.

Even on the most solemn occasions I got away without wearing socks and hid that lack of civilization in high boots

Vegetarian food leaves a deep impression on our nature. If the whole world adopts vegetarianism, it can change the destiny of humankind.

The world is not full of evil because of those who do wrong. It is full of evil because of those who do nothing.

The feeling for what ought and ought not to be grows and dies like a tree, and no fertilizer of any kind will do much good. What the individual can do is give a fine example, and have the courage to firmly uphold ethical convictions in a society of cynics. I have for a long time tried to conduct myself this way, with varying success.