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The best way to learn mathematics is to do mathematics.
聪明智慧的人,要保持着敦厚拙朴的态度,不可锋芒毕露;功高盖世的人,要保持着谦虚礼让的态度,不可居功自傲。勇猛无敌的人,要保持着小心谨慎的态度,不可无所忌惮;拥有巨财的人,要保持着如有不足的态度,不可张狂放肆。
An artist must be willing to fail.
Don't interfere with anything in the Constitution. That must be maintained, for it is the only safeguard of our liberties. And not to Democrats alone do I make this appeal, but to all who love these great and true principles.