A ship is always safe at the shore - but that is NOT what it is built for.

Nationalism is an infantile disease. It is the measles of mankind.

The unleashed power of the atom has changed everything save our modes of thinking and we thus drift toward unparalleled catastrophe.

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.

People like us, who believe in physics, know that the distinction between past, present, and future is only a stubbornly persistent illusion.

Isn't it strange that I who have written only unpopular books should be such a popular fellow?

It would be better if you began to teach others only after you yourself have learned something.