Insofar as mathematics is true, it does not describe the real world. Insofar as it describes the real world, it is not true.

Mathematics are well and good but Nature keeps dragging us around by the nose.

Insanity: doing the same thing over and over again and expecting different results.

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.

Culture in its higher forms is a delicate plant which depends on a complicated set of conditions and is wont to flourish only in a few places at any given time.

To get to know a country, you must have direct contact with the earth. It's futile to gaze at the world through a car window.

A man's value to the community primarily depends on how far his feelings, thoughts, and actions are directed towards promoting the good of his fellows.