Quietness cultivates one’s character, frugality cultivates virtue. ——Zhuge Liang

Quietness cultivates one’s character, frugality cultivates virtue. From Zhuge Liang's "Book of Commandments": "The conduct of a gentleman should be quiet to cultivate one's character, and frugal to cultivate virtue. If it is not indifferent, it will not clear its aspirations, and if it is not tranquil, it will not reach far." It means that tranquility is used to cultivate oneself, and frugality is used to cultivate moral character.

Be quiet to cultivate yourself, be frugal to cultivate your character.

A more popular point is:

Rely on inner peace and concentration to cultivate body and mind, and rely on frugal style to cultivate moral character.