Make friends, keep your word.
13、学习必须与实干相结合。——泰戈尔
Learning must be combined with practice.
14、人的大脑和肢体一样，多用则灵，不用则废。——茅以升
People's brain and limbs are the same. If you use it more, you will be able to use it more, and if you don't use it, you will lose it.
15、读书患不多，思义患不明;足己患不学，既学患不行。——韩愈
There are not many problems in reading, but one's thinking is not clear. If one has not learned enough, he will not be able to learn.
