北极仅有一盏路灯,南极也只有一盏;唯独北极的点灯人和他南极的同行,过着闲逸懒散的生活:他们每年只工作两次。
La haine est plus facile à nourrir que l'amour.
Learning makes wise, but does not make happy.
The best way to learn mathematics is to do mathematics.