The essence of mathematics lies in its freedom.
快樂不是現(xiàn)成的東西。它來自你自己的行動(dòng)。
以往花費(fèi)許多力量也不能推動(dòng)它，今天在水中間卻能自在地移動(dòng)。
"You can’t just sit down and write a book. That’s not how books get written. Books get written by living your life, by being open to the world, by paying attention."