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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.
But this long run is a misleading guide to current affairs. In the long run we are all dead.
The best way to learn mathematics is to do mathematics.
Your time is limited, so don't waste it living someone else's life.