Don't listen to their words, fix your attention on their deeds.

Concerning matter, we have been all wrong. What we have called matter is energy, whose vibration has been so lowered as to be perceptible to the senses. There is no matter.

Just because you believe in something does not mean that it is true.

If only I had known, I should have become a watchmaker.

The most important question a person can ask is, "Is the Universe a friendly place?

Mathematics deals exclusively with the relations of concepts to each other without consideration of their relation to experience.

Adversity introduces a man to himself.