I hate books when they are used. What is the next poem?

The next poem I don't hate so much when I use books is: it's not difficult to know it. This sentence means that when I use what I have learned, I always regret how badly I have learned. If I hadn't experienced something personally, I wouldn't know how difficult it was. When the book is used, people will hate less, and it is not difficult to do things without going through. This is a couplet written by Lu You, a poet in the Southern Song Dynasty, which was later included in Warning Confucian Diligence: there are fields that don't plow, and books that don't read. The edge of the sword comes from sharpening, and the fragrance of plum blossoms comes from bitter cold. If you don't study hard when you are young, you will regret studying late when you are old. I hate books when I use them, but I don't know how difficult it is until I pass by.