It is important to realize that in physics today, we have no knowledge of what energy is

The electron is a theory we use; it is so useful in understanding the way nature works that we can almost call it real.

We are at the very beginning of time for the human race. It is not unreasonable that we grapple with problems. But there are tens of thousands of years in the future. Our responsibility is to do what we can, learn what we can, improve the solutions, and pass them on.

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

I love only nature, and I hate mathematicians.

To those who do not know mathematics it is difficult to get across a real feeling as to the beauty, the deepest beauty, of nature ... If you want to learn about nature, to appreciate nature, it is necessary to understand the language that she speaks in.

Fall in love with some activity, and do it! Nobody ever figures out what life is all about, and it doesn't matter.