You can’t say A is made of B or vice versa. All mass is interaction.

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.

Scientists are explorers. Philosophers are tourists.

One cannot understand... the universality of laws of nature, the relationship of things, without an understanding of mathematics. There is no other way to do it.

Computer science is not as old as physics; it lags by a couple of hundred years. However, this does not mean that there is significantly less on the computer scientist's plate than on the physicist's: younger it may be, but it has had a far more intense upbringing!

What I cannot create, I do not understand.

Physics is like sex: sure, it may give some practical results, but that's not why we do it.