God may be subtle, but he isn't plain mean.

The greatest activity of which man is capable: Opening up yet another fragment of the frontier of beauty.

Student is not a container you have to fill but a torch you have to light up.

The time comes in life when we have read enough. It's time to stop reading. It's time to lay down the books and write.

Necessity is the mother of all invention.

We scientists, whose tragic destination has been to help in making the methods of annihilation more gruesome and more effective, must consider it our solemn and transcendent duty to do all in our power in preventing these weapons from being used for the brutal purpose for which they were invented.

While you're trying to get ahead, remember to get aheart as well. When your only problem IS a nail, all you want is a decent hammer. There are only two ways to live your life: one is as though nothing is a miracle; the other is as though everything is a miracle.