en_tn/pro/16/01.md

The plans of the heart belong to a person

Here the word "heart" represents the person's mind and thoughts. AT: "A person makes plans in his mind" (See: rc://en/ta/man/translate/figs-metonymy)

from Yahweh comes the answer from his tongue

Possible meanings are 1) Yahweh speaks his answer to a person's plans, which is a metaphor meaning that Yahweh determines the outcome of that person's plans or 2) Yahweh enables a person to speak words about the plans that he has made. (See: rc://en/ta/man/translate/figs-metaphor)

the answer from his tongue

The person is represented by his "tongue" to emphasize his speech. AT: "the answer that he speaks" (See: rc://en/ta/man/translate/figs-synecdoche)