动物的心脏是其生命的基础，是体内一切的主宰。

每一本书都是一段旅程，而每一段旅程都会让你有所改变。

A proof of a proposition is a process the nature of which is such as to produce in us a belief in that proposition.

拥有众多军队但不得军心，实质上和单人行动一样。