I never use a computer.
Always try the problem that matters most to you.
The greatest problem for mathematicians now is probably the Riemann Hypothesis.
I really believed that I was on the right track, but that did not mean that I would necessarily reach my goal
Then when I reached college, I realized that many people had thought about the problem during the 18th and 19th centuries and so I studied those methods.
Mathematics... is a bit like discovering oil. ... But mathematics has one great advantage over oil, in that no one has yet ... found a way that you can keep using the same oil forever.