The devil has put a penalty on all things we enjoy in life. Either we suffer in our health, or we suffer in our soul, or we get fat.

Truly novel inventions emerge only in one's youth. Later one becomes ever more experienced, famous-and foolish.

If people would only talk about what they understood, Earth would be a very quiet place.

The great need to grasp principles had caused me to spend most of my time on fruitless persuits.

I came to America because of the great, great freedom which I heard existed in this country. I made a mistake in selecting America as a land of freedom, a mistake I cannot repair in the balance of my lifetime.

I prefer an attitude of humility corresponding to the weakness of our intellectual understanding of nature and of our own being.

Long hair minimizes the need for barbers; socks can be done without; one leather jacket solves the coat problem for many years; suspenders are superfluous.