Never part without loving words to think of during your absence. It may be that you will not meet again in life.
We think in generalities, but we live in detail.
Our problems are man-made, therefore they may be solved by man. And man can be as big as he wants. No problem of human destiny is beyond human beings.
The man who has nothing to boast of but his illustrious ancestry is like the potato - the best part under ground.
I am not young enough to know everything.
Never feel self-pity, the most destructive emotion there is. How awful to be caught up in the terrible squirrel cage of self.
There is an evil tendency underlying all our technology - the tendency to do what is reasonable even when it isn't any good.