"Perseverance is so valuable that you need to sleep at three or five o'clock. The most useless thing is to be exposed to ten days of cold in one day."

Interpretation:

Perseverance is the most important thing in people. There is no need to go to bed at three o'clock every day and get up at five o'clock every day to mess around.

The scariest thing, and the least beneficial thing, is that one day you will have a sudden impulse and work hard, but then you will not move for more than ten days.

Warn people to persevere in everything and persist for several years, it will be beneficial.

Source: Mao Zedong

Similar sentences:

1. Black-haired people don’t know how to study early, and white-headed people regret studying late.

2. It is easier for a young person to learn than to become an old man, so no time is wasted. An inch of time is worth an inch of gold, it’s hard to buy time if you save money

3. If a young man doesn’t work hard, the old man will be miserable.