The only thing we can be certain of in this life is that we can be certain of nothing.

The intellect has little to do on the road to discovery. There comes a leap in consciousness, call it Intuition or what you will, the solution comes to you and you don't know how or why.

This is what the painter, the poet, the speculative philosopher, and the natural scientists do, each in his own fashion.

What I see in Nature is a grand design that we can understand only imperfectly, one with which a responsible person must look at with humility.

The road to perdition has ever been accompanied by lip service to an ideal.

Any brief military advantage the USA might gain with nuclear weapons would be offset by political and psychological losses and damage to American prestige. The United States might even touch off a worldwide armaments race.

But science can only be created by those who are thoroughly imbued with the aspiration toward truth and understanding. This source of feeling, however, springs from the sphere of religion. To this there also belongs the faith in the possibility that the regulations valid for the world of existence are rational, that is, comprehensible to reason. I cannot conceive of a genuine scientist without that profound faith. The situation may be expressed by an image: science without religion is lame, religion without science is blind.