I am opposed to looking upon logic as a kind of game. ... One might think that it is a matter of choice or convention which logic one adopts. I disagree with this view.

The more we learn about the world, and the deeper our learning, the more conscious, specific, and articulate will be our knowledge of what we do not know, our knowledge of our ignorance

Historically speaking all - or very nearly all - scientific theories originate from myths.

Good tests kill flawed theories; we remain alive to guess again.

It is wrong and dangerous to extol freedom by telling people that they will certainly be all right once they are free. The most we can say of democracy or freedom is that they give our personal abilities a little more influence on our well-being.

The moral decisions of others should be treated with respect, as long as such decisions do not conflict with the principle of tolerance.

The future is always present, as a promise, a lure and a temptation.