All religions, arts and sciences are branches of the same tree. All these aspirations are directed toward ennobling man's life, lifting it from the sphere of mere physical existence and leading the individual towards freedom.

I would absolutely refuse any direct or indirect war service and would try to persuade my friends to do the same, regardless of the reasons for the cause of a war.

Example isn't another way to teach, it is the only way to teach.

Life is sacred, that is to say, it is the supreme value, to which all other values are subordinate.

No path leads from a knowledge of that which is to that which should be.

Relativity teaches us the connection between the different descriptions of one and the same reality.

The supreme task of the physicist is to arrive at those universal elementary laws from which the cosmos can be built up by pure deduction. There is no logical path to these laws; only intuition, resting on sympathetic understanding of experience, can reach them.