en_tn/pro/19/21.md

in a person's heart

Here the "heart" is used to refer to the "mind" to emphasize a person's desire. AT: "in a person's mind" or "that a person desires" (See: rc://en/ta/man/translate/figs-metonymy)

the purpose of Yahweh

"Yahweh's purpose" or "Yahweh's plans"

that will stand

This idiom means to "happen." AT: "that will happen" (See: rc://en/ta/man/translate/figs-idiom)