What one doesn't understand one doesn't possess.

Everything that we encounter leaves traces behind. Everything contributes imperceptibly to our education

As man is, so is his God. And thus is God oft strangely odd.

Energy is the basis of everything. Every Jew, no matter how insignificant, is engaged in some decisive and immediate pursuit of a goal... It is the most perpetual people of the earth.

Without my attempts in natural science, I should never have learned to know mankind such as it is. In nothing else can we so closely approach pure contemplation and thought, so closely observe the errors of the senses and of the understanding, the weak and strong points of character.

No one should be rich except those who understand it.

All theory, my friend, is grey, But green is life's glad golden tree.