Since the mathematicians have invaded the theory of relativity I do not understand it myself any more.

The majority of the stupid is invincible and guaranteed for all time. The terror of their tyranny, however, is alleviated by their lack of consistency.

Galileo had already made a significant beginning toward a knowledge of the law of motion. He discovered the law of inertia and the law of bodies falling freely in the gravitational field of the earth.

Where you see difficulty, I see opportunity.

I never thought that others would take my theories so much more seriously than I did.

A man's ethical behaviour should be based effectually on sympathy, education, and social ties and needs; no religious basis is necessary. Man would indeed be in a poor way if he had to be restrained by fear of punishment and hope of reward after death.

I believe in intuition and inspiration...at times I feel certain I am right while not knowing the reason.