Agreements about what is good or not, are usually not worth much. It is very much like art, is it not an art to lead a good life?

The most important human endeavor is the striving for morality in our actions.

If [quantum theory] is correct, it signifies the end of physics as a science.

We know nothing at all. All our knowledge is but the knowledge of schoolchildren. The real nature of things we shall never know.

I consider it important, indeed urgently necessary, for intellectual workers to get together, both to protect their own economic status and, also, generally speaking, to secure their influence in the political field.

... a person who is religiously enlightened appears to me to be one who has, to the best of his ability, liberated himself from the fetters of his selfish desires and is preoccupied with thoughts, feelings, and aspirations to which he clings because of their superpersonal value.

The scientist is activated by a wonder and awe before the mysterious comprehensibility of the universe which is yet finally beyond his grasp. In its profoundest depths it is inaccessible to man.