Try not to become a man of success but rather try to become a man of value.

I am thankful to all who said no to me. It is because of them that I'm doing it myself.

Something deeply hidden had to be behind things.

Physical concepts are free creations of the human mind,and are not however it may seem, uniquely determined by the external world.

I salute the man who is going through life always helpful, knowing no fear, and to whom aggressiveness and resentment are alien.

I believe in intuition and inspiration. Imagination is more important than knowledge. For knowledge is limited, whereas imagination embraces the entire world, stimulating progress, giving birth to evolution. It is, strictly speaking, a real factor in scientific research.

I received your letter of June 10th. I have never talked to a Jesuit priest in my life and I am astonished by the audacity to tell such lies about me. From the viewpoint of a Jesuit priest I am, of course, and have always been an atheist.