Knowledge fills a large brain; it merely inflates a small one.

When I hear somebody sigh, 'Life is hard,' I am always tempted to ask, 'Compared to what?'

Sometimes the best, and only effective, way to kill an idea is to put it into practice.

Man's unique agony as a species consists in his perpetual conflict between the desire to stand out and the need to blend in.

It's surprising how many persons go through life without ever recognizing that their feelings toward other people are largely determined by their feelings toward themselves, and if you're not comfortable within yourself, you can't be comfortable with others.

Ancient boundaries are meaningless, except for political purposes; old divisions of clan and tribe are sentimental remnants of the pre-atomic age; neither creed nor color nor place of origin is relevant to the realities of modern power to utterly seek and destroy.

Good teaching must be slow enough so that it is not confusing, and fast enough so that it is not boring.