All these constructions and the laws connecting them can be arrived at by the principle of looking for the mathematically simplest concepts and the link between them.

The truth of a theory can never be proven, for one never knows if future experience will contradict its conclusions.

Overemphasis of the competitive system and premature specialization on the ground of immediate usefulness kill the spirit on which all cultural life depends, specialized knowledge included.

Conviction is a good motive, but a bad judge.

Man can find meaning in life only through devoting himself to society.

[O]nly if every individual strives for truth can humanity attain a happier future; the atavisms in each of us that stand in the way of a friendlier destiny can only thus be rendered ineffective.

What is inconceivable about the universe is that it is at all conceivable.