大抵贤圣发愤之所为作也。
史记
数学是一种超越文化和语言障碍的通用语言。
Man is not the creature of circumstances; circumstances are the creatures of men.
Do not try to change the outer world; change your inner world, and the outer world will adjust itself.
People are just as wonderful as sunsets if you let them be. When I look at a sunset, I don't find myself saying, "Soften the orange a bit on the right hand corner." I don't try to control a sunset. I watch with awe as it unfolds.