Hunger, love, pain, fear are some of those inner forces which rule the individual's instinct for self preservation.

The difference between stupidity and genius is that genius has its limits.

You must be aware that most men (and also not only a few women) are by nature not monogamous. This nature makes itself even more forceful when tradition and circumstance stand in an individual's way.

What separates me from most so-called atheists is a feeling of utter humility toward the unattainable secrets of the harmony of the cosmos.

For me the Jewish religion like all other religions is an incarnation of the most childish superstitions.

You believe in the God who plays dice, and I in complete law and order in a world that objectively exists, and which I, in a wildly speculative way, am trying to capture. ... Even the great initial success of the quantum theory does not make me believe in the fundamental dice-game, although I am well aware that our younger colleagues interpret this as a consequence of senility. No doubt the day will come when we will see whose instinctive attitude was the correct one.

Do not grow old, no matter how long you live. Never cease to stand like curious children before the Great Mystery into which we were born.