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

Always try the problem that matters most to you.

The only way I could relax was when I was with my children.

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.

I really believed that I was on the right track, but that did not mean that I would necessarily reach my goal

We've lost something that's been with us for so long, and something that drew a lot of us into mathematics. But perhaps that's always the way with math problems, and we just have to find new ones to capture our attention.

Fermat said he had a proof.