It turns out that all life is interconnected with all other life.

In fact the total amount that a physicist knows is very little. He has only to remember the rules to get him from one place to another and he is all right.

If all of mathematics disappeared, physics would be set back by exactly one week.

When things are going well, something will go wrong. / When things just can't get any worse, they will. / Anytime things appear to be going better, you have overlooked something.

When you get as old as I am, you start to realize that you've told most of the good stuff you know to other people anyway.

The female mind is capable of understanding analytic geometry... The difficulty may just be that we have never yet discovered a way to communicate with the female mind. If it is done in the right way, you may be able to get something out of it.

God was invented to explain mystery. God is always invented to explain those things that you do not understand.