The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

The heart of animals is the foundation of their life, the sovereign of everything within them.

种一棵树最好的时间是二十年前，其次是现在。

翻译：如果士卒还未真心拥护就施加刑罚，他们就不服，不服就难以使用；如果士卒已经真心拥护了还不施加刑罚，也不可用。

每件负面的事–压力、挑战–都是一个让我提升的良机。