If it disagrees with experiment, it's wrong.

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

We decided that 'trivial' means 'proved'. So we joked with the mathematicians: We have a new theorem- that mathematicians can prove only trivial theorems, because every theorem that's proved is trivial.

To do any important work in physics a very good mathematical ability and aptitude are required. Some work in applications can be done without this, but it will not be very inspired. If you must satisfy your "personal curiosity concerning the mysteries of nature" what will happen if these mysteries turn out to be laws expressed in mathematical terms (as they do turn out to be)? You cannot understand the physical world in any deep or satisfying way without using mathematical reasoning with facility.

Experiment is the sole judge of the validity of any idea.

Nature has a great simplicity and therefore a great beauty.

Work hard to find something that fascinates you.