A human being is part of a whole called by us the universe.

Older men start wars, but younger men fight them.

Everything that the human race has done and thought is concerned with the satisfaction of deeply felt needs and the assuagement of pain. One has to keep this constantly in mind if one wishes to understand spiritual movements and their development. Feeling and longing are the motive force behind all human endeavor and human creation, in however exalted a guise the latter may present themselves to us.

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.

The splitting of the atom has changed everything except for how we think.

We cannot despair of humanity, since we ourselves are human beings.

Playfullness is the essential feature of productive thought.