Psalm 89:29 Meaning

27Also I will make him my firstborn, higher than the kings of the earth.

28My mercy will I keep for him for evermore, and my covenant shall stand fast with him.

29His seed also will I make to endure for ever, and his throne as the days of heaven.

30If his children forsake my law, and walk not in my judgments;

31If they break my statutes, and keep not my commandments;