SILENT TRUMPET!

An oxymoron or a pithy phrase?
Trumpets herald events, but what does a silent trumpet herald?

A silent trumpet is a human who spurs action and moves people without uttering a sound.

A silent trumpet is any human who does good without fanfare or flamboyance.

A silent trumpet changes the world by action without uttering any sound or noise.

A silent trumpet is another way of saying actions speak louder than words.

Are you a silent trumpet or a loud, noisy, and useless trumpet?