Heaven is angered by my arrogance; my proof [of the four-color theorem] is also defective.

Integers are the fountainhead of all mathematics.

Henceforth space by itself, and time by itself, are doomed to fade away into mere shadows, and only a kind of union of the two will preserve an independent reality.

Oh, that Einstein, always skipping lectures... I certainly never would have thought he could do it.

The mathematical education of the young physicist [Albert Einstein] was not very solid, which I am in a good position to evaluate since he obtained it from me in Zurich some time ago.

Nobody wants great things for you. They all want you to be something they deem important for them.

Dogs own space and cats own time.

He's as nutty as a vegan T-bone.

When you treat yourself right, you run better and more efficiently. Which means you don't have to go 100 miles an hour to get everything done.

Ask courageous questions. Do not be satisfied with superficial answers.

You must show the world that you abhor fighting.

And the reason that i laugh and breathe is oh love

Those who cannot condemn the past repeat it in order to remember it.

I have no problem with thinking small. Sometimes you have to think small first in order to think big.

At age 19, I read a book [The Intelligent Investor] and what I'm doing today, at age 76, is running things through the same thought process I learned from the book I read at 19.