The soul that has conceived one wickedness can nurse no good thereafter.
The man who moves a mountain begins by carrying away small stones.
随机实验是因果推理的黄金标准，但它们并不总是可行的。
人类是一种非常奇特的生物。他认为自己有一个灵魂，但他就是一个灵魂；他有一个身体。