The unleashed power of the atom has changed everything except our thinking. Thus, we are drifting toward catastrophe beyond conception. We shall require a substantially new manner of thinking if mankind is to survive.

I have always loved solitude, a trait which tends to increase with age.

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

It is a magnificent feeling to recognize the unity of complex phenomena which appear to be things quite apart from the direct visible truth.

Most mistakes in philosophy and logic occur because the human mind is apt to take the symbol for the reality.

We [Jews] have no other means of self-defense than our solidarity

Be a loner. That gives you time to wonder, to search for the truth. Have holy curiosity. Make your life worth living.