"Happiness is not something ready made. It comes from your own actions."
The major credit I think Jim and I deserve... is for selecting the right problem and sticking to it.
【释义】财富的增长在于方法和策略，不在于身体的辛劳；利益的获取在于地位和权势，不在于辛勤耕种。
Psychological concepts must prove their worth in action.