A poem about the importance of hands-on

What you get on paper is so shallow that you never know what you have to do.

Lu You, a patriotic poet in the Song Dynasty, wrote a poem entitled "Reading on a Winter Night": "The ancients learned nothing, but it takes time for people to grow old. I feel that on paper, I never know if this should be done. " Warn my son that the knowledge gained only from books is still one-sided, and it is more important to practice it yourself.