Everything should be made as simple as possible, but not simpler.
You can know the name of a bird in all the languages of the world, but when you're finished, you'll know absolutely nothing whatever about the bird… So let's look at the bird and see what it's doing — that's what counts. I learned very early the difference between knowing the name of something and knowing something.
When you understand something, then you can find the math to express that understanding. The math doesn't provide the understanding.
Imagination is more important than knowledge.
When you have satisfied yourself that the theorem is true, you start proving it.
Remember that, you are a son before becoming a father.
Two things are infinite, the universe and human stupidity; and I'm not sure about the universe.