No disaster is worse than being discontented.

Nature is not human hearted.

The difficult problems in life always start off being simple. Great affairs always start off being small.

Those who praise victory relish manslaughter. Those who relish manslaughter cannot reach their goals in the world.

Knowing others is intelligence; knowing yourself is true wisdom. Mastering others is strength; mastering yourself is true power.

He who controls the past controls the future.

A good calculator does not need artificial aids.