翻译：既了解敌人，又了解自己，每次作战都不会有危险。

顺从天意的**是以义服人的**，违反天意的**是以力服人的**。 

Efficiency in farming shouldn’t come at the cost of biodiversity.

The real contest is always between what you've done and what you're capable of doing. You measure yourself against yourself and nobody else.