Temper the tongue.

It advises controlling one’s speech: speak with restraint rather than letting anger, impulse, or harshness direct the words.

The emphasis is on the manner of speaking, including tone and choice of words. A response can be firm while avoiding language chosen in anger or intended to wound.

Use it to urge someone to moderate what they say, especially when emotion may lead to harsh, impulsive, or hurtful language.