数学证明的优雅常常反映了它所描述的算法的效率。

A picture must be grasped at once, as a whole, like a piece of music.

Art is contemplation. It is the pleasure of the mind which searches into nature and which there divines the spirit of which nature herself is animated.

粒子的概念只是一种近似，仅在特定极限情况下有效。