The infinite in mathematics is always unruly unless it is properly treated.

Mathematics is the science which uses easy words for hard ideas.

Mathematics is man's own handiwork, subject only to the limitations imposed by the laws of thought.

The testament of science is so continually in a flux that the heresy of yesterday is the gospel of today and the fundamentalism of tomorrow.

Perhaps the greatest paradox of all is that there are paradoxes in mathematics.

. . . we have overcome the notion that mathematical truths have an existence independent and apart from our own minds. It is even strange to us that such a notion could ever have existed.

Mathematics is an activity governed by the same rules imposed upon the symphonies of Beethoven, the paintings of DaVinci, and the poetry of Homer.

Courage isn't something you can conjure, it's either in you or it's not.

Be the best person you can be for yourself and for everyone around you.

For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.

The last stage but one of every civilisation, is characterised by the forced political unification of its constituent parts, into a single greater whole.

I have more critics than Hitler.

If reincarnation is a useful biological idea it is certain that somewhere in the universe it will happen.

If two men agree on everything, you may be sure that one of them is doing the thinking.

If you're on to something but you start repeating it, that's the end of your career.

I'm either mentally ill or Jewish. I can't sometimes tell the difference.