On Knowing
The grandmonk Yunxing said: During your teen aged years, you should repair yourself; in youth, you should face yourself; in adulthood, you should expand yourself; and in old age, you should complete yourself. In spring, you should be upbeat; in summer, you should raise yourself; in the fall, you should be diligent; and in winter, you should be retrospective. The four quarters of human life and four seasons of the year. Know yourself.---That's a lot of stuff to digest. Better get something to eat first. Philosophical words are good for the smart and the fool. The average guy needs actions such as what the next meal will be.
Source: https://practicalmethod.com/?p=10431