The unanswerable mysteries... the attitude that all is uncertain... to summarize it - the humility of the intellect.

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.

I learned very early the difference between knowing the name of something and knowing something.

Strange! I don't understand how it is that we can write mathematical expressions and calculate what the thing is going to do without being able to picture it.

The idea is to try to give all the information to help others to judge the value of your contribution; not just the information that leads to judgment in one particular direction or another.

Just as a poet often has license from the rules of grammar and pronunciation, we should like to ask for 'physicists' license from the rules of mathematics in order to express what we wish to say in as simple a manner as possible.

I love to think. I once considered taking drugs as an attempt to better understand an altered state of mind; however, I decided not to. I didn't want to chance ruining the machine.