Please talk about Ouyang Xiu's teaching view.

"Jade is uncut, abrasive; People don't learn, they don't know. However, jade is one thing, and Changde is constant. Although it has not been polished, it still has no harm to jade. Human nature, because things will move, if you don't learn, you will be a villain, not a gentleman, but don't think about it.

Jade can't be made into utensils without polishing; If you don't study, you won't understand the truth. However, jade has eternal characteristics. Even if it is not polished or made into an object, it is still jade and will not be damaged. Human nature will change under the influence of external things. Therefore, if people don't study, they will lose the noble character of a gentleman and become villains with bad conduct. Isn't it worth pondering?