To test whether you have learned an idea or a definition, rephrase what you just learned without using the new word.

Why make yourself miserable saying things like, "Why do we have such bad luck? What has God done to us? What have we done to deserve this?" - all of which, if you understand reality and take it completely into your heart, are irrelevant and unsolvable. They are just things that nobody can know. Your situation is just an accident of life.

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.

There is a computer disease that anybody who works with computers knows about. It's a very serious disease and it interferes completely with the work. The trouble with computers is that you 'play' with them!

Work hard to find something that fascinates you.

Of course, you only live one life, and you make all your mistakes, and learn what not to do, and that's the end of you.