Choose a famous saying as a motto and say why

Suggest one, this sentence is from "Xiangzhuan" written by Confucius for the Zhouyi (The Book of Changes). For reference:

The sky is healthy, the gentleman to self-improvement. The earth is strong, and the gentleman carries things in a generous manner.

This sentence can be translated as follows: A gentleman should be like the heavens that run unceasingly, even if upheaval and dislocation, but also unyielding; if you are a gentleman, you should be like the earth in terms of receiving things, and nothing can't be carried. This phrase was chosen as the motto because: "self-improvement" and "virtue" are the two spiritual lifeblood of traditional Chinese culture, and also the source of the spirit and strength of the Chinese nation to live on and stand proudly in the world.