Psalm 119, longest chapter in the Bible. The writer is so convinced the law is a great thing. This startles us, because we're convinced Jesus is so much greater than the Law. As John says, the law came through Moses, grace and truth came through Jesus Christ.
But Psalm 119 does say God is greater than the law. "Your word, Lord, is eternal. It stands firm in the heavens. Your faithfulness continues through all generations." Just as John proclaims the Word as eternal, from the beginning with God, the Word with God, who is God.
Psalm 89 reminds us of something else firm in the heavens. God's covenant with David, to establish his line, his throne forever. Praise to the Son of David, who has ruled, who will rule forever.