David encourages praises from himself, from the people in general, and even from the angels and hosts of heaven.

To such as keep his covenant; to them that perform the condition of God's covenant, that sincerely love and obey him.

The covenant of grace, which is peculiarly the Lord's covenant, as distinct from man's; and which he keeps himself, and is ever mindful of it.

18 He always loves those who keep his covenant. He always does what is right for those who remember to obey his commands. Psalms 103:18 Meaning and Commentary.

The faithful are reminded that their relationship with God is anchored in His everlasting mercy, which persists even when human life is transient.

Psalm 103:17-18 reminds us of the enduring nature of God's love and righteousness. It assures us that His loving kindness is from everlasting to everlasting.

Observe, (1.) ... Observe, God's mercy is thus great towards those that fear him, not towards those that trifle with him. We must fear the Lord and his goodness.

But in these verses, David's focus is on God's covenant faithfulness to forgive the sins of those who fear Him (v. 17), keep His covenant, and obey Him (v.18).

Know therefore that the LORD your God is God, the faithful God who keeps His covenant of loving devotion for a thousand generations of those who love Him and ...