Study hard what interests you the most in the most undisciplined, irreverent and original manner possible.

There is no harm in doubt and skepticism, for it is through these that new discoveries are made.

That is the logical tight-rope on which we have to walk if we wish to interpret nature.

The difficulty really is psychological and exists in the perpetual torment that results from your saying to yourself, "But how can it be like that?" which is a reflection of uncontrolled but utterly vain desire to see it in terms of something familiar. ... If you will simply admit that maybe Nature does behave like this, you will find her a delightful, entrancing thing. Do not keep saying to yourself, if you can possible avoid it, "But how can it be like that?" because you will get 'down the drain', into a blind alley from which nobody has escaped. Nobody knows how it can be like that.

Teach principles not formulas.

There is no authority who decides what is a good idea.

It is the fact that the electrons cannot all get on top of each other that makes tables and everything else solid.