Fearless is not the absence of fear. It’s not being completely unafraid. To me, fearless is having fears. Fearless is having doubts. Lots of them. To me, fearless is living in spite of those things that scare you to death.
The elegance of a theory is not just in its mathematical formulation, but in its ability to connect disparate phenomena under a unified framework.
A Jewish man with parents alive is a fifteen-year-old boy, and will remain a fifteen-year-old boy until they die!
In mathematics, you don't understand things. You just get used to them.