en_tn/2ch/30/19.md

who sets his heart to seek God

This continues the sentence that begins with the word "everyone" in verse 18.Here "sets his heart" is a metaphor for being determined to do something, and "to seek God" is a metaphor for knowing, worshiping, and obeying him. "everyone who is determined to obey God" or "everyone who truly wants to honor God" (See: rc://en/ta/man/jit/figs-metaphor)