"Winter Night Reading Shows Ziyu"
(Southern Song Dynasty) Lu You, the ancients, spared no effort in learning, and it was only when he was young that he worked hard and became mature.
After reading on paper, he finally realized it. Qian, I definitely know that this matter must be practiced. The first two sentences should be used to educate your son to persevere. The meaning is that the ancients always tried their best to learn, and only by working hard when they are young can they achieve something when they are old; so they must persevere. The last two sentences The sentence emphasizes the need to practice what you have learned, apply what you have learned, and focus on practice.