Gou means "if" in the text, and the similar usage is "Gou Fugui, don't forget each other." What remains unchanged is "perseverance". This is also an ancient night unit. A night is divided into five watches, when it is a night, two watches are at sea, three watches are at midnight, four watches are at the clown, and five watches are in Yin Shi. The time corresponding to the third watch is about 1 1- 1 o'clock in the evening, and the fifth watch is about 4-5 o'clock the next morning. Going to bed at midnight means going to bed late and getting up early. Even the most easily growing plants can't grow even if they are exposed to the sun for one day and frozen for ten days. Metaphor study or work hard, lazy, no perseverance.
The original sentence means: if you have perseverance, why get up early and get greedy every day; The worst thing is to do it for a day, rest for ten days, and have only three minutes of heat. Highlight the importance of perseverance from both positive and negative aspects, and encourage people to persevere.