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

It's fine to work on any problem, so long as it generates interesting mathematics along the way - even if you don't solve it at the end of the day.

Always try the problem that matters most to you.

The definition of a good mathematical problem is the mathematics it generates rather than the problem itself.

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.

However impenetrable it seems, if you don't try it, then you can never do it.

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