Death and life are in the power of the tongue,
and those who love it will eat of its fruit. Bible see other translations

“and those who love it will eat of its fruit.” When the text says, those who love “it,” the “it” refers to the tongue. The “tongue” is put by metonymy for the words spoken, because the tongue is able to deliver words of death or life. Those who love “it” are people who enjoy the power that language brings, and they use their tongue in a way that achieves their desired objectives. These objectives can be positive (i.e., giving life), or negative (i.e., producing death). But the proverb is also asserting that in a reciprocal way, the person speaking will reap the reward or consequence of their words. An interesting fact about speaking is that the effect the words have on the hearer is also the effect that the words have on the speaker. The speaker who speaks words of life also gets life as a consequence of what they say, while the one who speaks words of death reaps the consequence of death from what they say.

Commentary for: Proverbs 18:21