I know it's a rare privilege, but if one can really tackle something in adult life that means that much to you, then it's more rewarding than anything I can imagine.

Always try the problem that matters most to you.

There are proofs that date back to the Greeks that are still valid today.

Just because we can't find a solution it doesn't mean that there isn't one.

The greatest problem for mathematicians now is probably the Riemann Hypothesis.

I never use a computer.

But the best problem I ever found, I found in my local public library.