韩寒：“其实说穿了，教师只是一种职业，是养家糊口的一个途径，和出租车司机，清洁工没有本质的区别。”

The environment is not a mosaic of stimuli, but a field of forces in which every part is dynamically related to every other part.

To every action there is always opposed an equal reaction； or， the mutual actions of two bodies upon each other are always equal， and directed to contrary parts.

Mathematics is a language that allows us to describe the indescribable.

Less is more only when more is too much.