Theorems are not discovered by accident.
The deepest problems in mathematics often arise from the simplest questions.
I've learned that you can't control what other people say about you, but you can control how you react to it.
Today is cruel, tomorrow is crueler, and the day after tomorrow is beautiful. But most people will die tomorrow night.
There is no escape, only different kinds of prisons.
The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' but 'That's funny...'