What are the low-key sentences?

The more sharp-edged people are, the more high-profile and conceited they are, thinking that they are omniscient and omnipotent, and the arrogance, ostentation and excessive publicity they inadvertently show, the more they make others feel alert and disgusted; Even if such a person has a temporary glory, it is bound to be difficult to last long.

Writer Yang Daxia believes that low-key should be associated with self-confidence.

The truly capable men are hidden, low-key but not lacking in self-confidence, have a clear understanding of themselves, be low-key, be humble, never rest on their laurels, and the more ordinary they pretend, the more extraordinary they are!