Sometimes the most profound mathematics comes from playing with simple ideas until they reveal their hidden complexity.
逻辑是一回事,常识是另一回事。
在每一本书中,都有作者灵魂的一部分。
有些人如果好好鼓励,做得出一番事业;但是,还是做那种不论险阻艰辛都要干下去的汉子吧。
Love is the most powerful force in the world.