It is a miracle that curiosity survives formal education.

Do not worry about your difficulties in Mathematics. I can assure you mine are still greater.

The most important human endeavor is the striving for morality in our actions.

Whether or not you can observe a thing depends upon the theory you use. It is the theory which decides what can be observed.

Compound interest is the eighth wonder of the world. He who understands it, earns it ... he who doesn't ... pays it.

The road to perdition has ever been accompanied by lip service to an ideal.

Logic will get you from A to B. Imagination will take you everywhere.