"In mathematics, you don't understand things. You just get used to them."
在数学中，你不是理解事物，你只是习惯了它们。
The best way to measure how much you've grown isn't by inches or the number of laps you can now run around the track, or even your grade point average - though those things are important, to be sure.It's what you've done with your time, how you've chosen to spend your days, and whom you've touched this year. That, to me, is the greatest measure of success.