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

We've learned from experience that the truth will out.

In physics the truth is rarely perfectly clear, and that is certainly universally the case in human affairs. Hence, what is not surrounded by uncertainty cannot be the truth.

In fact the total amount that a physicist knows is very little. He has only to remember the rules to get him from one place to another and he is all right.

The basis of action on love, the brotherhood of all men, the value of the individual... the humility of the spirit.

Any schemes - such as 'think of symmetry laws', or 'put the information in mathematical form', or 'guess equations'- are known to everybody now, and they are all tried all the time. When you are stuck, the answer cannot be one of these, because you will have tried these right away...The next scheme, the new discovery, is going to be made in a completely different way.

As usual, nature's imagination far surpasses our own, as we have seen from the other theories which are subtle and deep.