Nature has placed mankind under the governance of two sovereign masters, pain and pleasure.
自然将人类置于两位至高无上的主人——痛苦和快乐的统治之下。
解释:饿了再吃,粗茶淡饭味道也像吃肉一样可口。安稳走路就不会感觉到劳累,权当坐车。
心灵是一个可以在多个层次上分析的复杂系统。
The highest possible stage in moral culture is when we recognize that we ought to control our thoughts.