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

Creativity is contagious. Pass it on.

There are two ways to live: you can live as if nothing is a miracle; you can live as if everything is a miracle.

He who finds a thought that lets us a little deeper into the eternal mystery of nature has been granted great peace.

The most important human endeavor is the striving for morality in our actions. Our inner balance and even our very existence depend on it. Only morality in our actions can give beauty and dignity to life.

It's not that life has been easy, perfect or exactly as expected. I just choose to be happy and grateful no matter how it all turns out. If people are good only because they fear punishment, and hope for reward, then we are a sorry lot indeed.

Physics is essentially an intuitive and concrete science. Mathematics is only a means for expressing the laws that govern phenomena.