A poem describing an uneducated person. thank you

Teenagers only know how to play, but don't know how to study hard. When they are old, they regret why they didn't know how to study hard when they were young. Teenagers have worked hard all their lives, so don't spare no effort to learn from the lazy ancients. When they were young, they would read thousands of books and write like gods. Ask where the canal is so clear, because there is running water at the source. A lazy youth, a lousy age. Once the youth is gone, it will never come again, and you will never see the arrival of the next day. Be encouraged in time. Time waits for no one, turns a deaf ear to things outside the window and reads only sage books. The edge of the sword comes from sharpening, and the fragrance of plum blossoms comes from bitter cold. Learning is not to explore its flowers, but to dig its roots. After ten years of grinding a sword, the frost blade has never tried. Therefore, I never get tired of reading books, and I am familiar with them. I know when I will return to the west. Young people don't work hard, old people will cherish short days, sad people will know that the night is long and the young people's heads will be empty.