For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled.

All theoretical chemistry is really physics; and all theoretical chemists know it.

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

It is in the admission of ignorance and the admission of uncertainty that there is a hope for the continuous motion of human beings in some direction that doesn't get confined, permanently blocked, as it has so many times before in various periods in the history of man.

The first principle is that you must not fool yourself - and you are the easiest person to fool.

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.