Understanding is inventing.
The harder the conflict, the more glorious the triumph.
The challenge is to make the invisible visible.
In mathematics, the art of proposing a question must be held of higher value than solving it.
"In the end, we are all alone, and that is the most terrifying truth of all."
不和屯积钱财的人争较财富多少;不和热心仕途的人争较地位高下;不和骄傲自夸的人争较名声大小;不和年轻力壮的人争较仪容风度,不和逞强好胜的人争较胜负高低。