Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work.
The interplay between mathematics and physics has led to some of the most profound insights in science.
Never ask a barber if you need a haircut.
The reality is: sometimes you lose. And you're never too good to lose. You're never too big to lose. You're never too smart to lose. It happens.