Psalm 132:12 says: "If your sons will keep My covenant and My testimony which I will teach them, their sons also shall sit upon your throne forever." David seems to refer to this in 1 Kings 2:1-4, where he urges his son Solomon to obey the Lord in light of the fact that the Lord had said: "If your sons are careful of their way, to walk before Me in truth with all their heart and with all their soul, you shall not lack a man on the throne of Israel." (v4). Here it's conditional. But elsewhere, the perpetuity of David's throne is an unconditional promise (2 Samuel 7:16). How are we to understand the difference in requirement between these texts (conditional vs unconditional)? And how are we to understand the specific nature of this condition in the Davidic Covenant? And then especially, seeing that this covenant belongs to the Covenant of Grace, what are the inferences and applications for us?