Poverty is not inevitable; it's a solvable problem.

Twenty years of romance make a woman look like a ruin; but twenty years of marriage make her look like a public building.

I don't have any particular recipe [for developing new proofs] ... It is the reason why doing research is challenging as well as attractive. It's like being lost in a jungle and trying to use all the knowledge that you can gather to come up with some new tricks, and with some luck you might find a way out.

We must build a world in which there shall be no economic domination, no exploitation, no unemployment, and no war.