To sense that behind anything that can be experienced there is a something that our mind cannot grasp and whose beauty and sublimity reaches us only indirectly and as a feeble reflection, this is religiousness. In this sense I am religious.

Non-cooperation in military matters should be an essential moral principle for all true scientists.

A theory can be proved by experiment; but no path leads from experiment to the birth of a theory.

If God has created the world, his primary worry was certainly not to make its understanding easy for us

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 live in that solitude which is painful in youth, but delicious in the years of maturity.

Striving for social justice is the most valuable thing to do in life.