There are only two kinds of people, those who accept dogmas and know it, and those who accept dogmas and don't know it.

Man can learn nothing unless he proceeds from the known to the unknown.

The universe is wider than our views of it.

No one returns with good will to the place which has done him a mischief.

Knowing your own darkness is the best method for dealing with the darknesses of other people.

I have no desire to suffer twice, in reality and then in retrospect.

When you consider things like the stars, our affairs don't seem to matter very much, do they?

In order to enjoy the inestimable benefits that the liberty of the press ensures, it is necessary to submit to the inevitable evils that it creates.

I have always believed, and I still believe, that whatever good or bad fortune may come our way we can always give it meaning and transform it into something of value.

I believe in Christianity as I believe that the sun has risen — not only because I see it, but because by it I see everything else.

Religion is a great force—the only real motive force in the world; but what you fellows don't understand is that you must get a man through his own religion and not through yours.

A wise man proportions his belief to the evidence.

When the intensity of emotional conviction subsides, a man who is in the habit of reasoning will search for logical grounds in favor of the belief which he finds in himself.

When we are tired, we are attacked by ideas we conquered long ago.

An hour of planning can say you 10 hours of doing.

I've always felt that a person's intelligence is directly reflected by the number of conflicting points of view he can entertain simultaneously on the same topic.

Do not stop thinking of life as an adventure. You have no security unless you live bravely, excitingly, imaginatively.