1 sentence

1. 纸上得来终觉浅，绝知此事要躬行。

   zhǐ​shàng dé lái zhōng jué qiǎn, jué zhī cǐ shì yào gōng​xíng.

   What is learned from books is always superficial; to understand something deeply, one must practice it personally.

   Source: Dong Chinese Dictionary