Psalm of David: I will sing of the LORD's great love forever; with my mouth I will make your faithfulness known through all generations. Psalm 89:1

Psalm 89 is a Psalm attributed to King David, in which the greatness of God and the covenant made between the great king and the Lord through the prophet Nathan are celebrated. The hymn has a third part that was probably added later, in which there is a lament for the King and a plea for the divine mercy. The hymn has a special spiritual value for all Christians because it recalls the promise made by God about the arrival of a savior, a promise that would be fulfilled, according to the Christian faith, with the birth of Jesus.
The song begins with an acknowledgment of God's perfect love for mankind, and Israel in particular, with these words: "I will sing of the LORD's great love forever; with my mouth I will make your faithfulness known through all generations" Psalm 89:1.
With this spiritual expression, David acknowledged that God's love surpasses all human weaknesses and imperfections. God's love is the love perfected by the nature of the good, and therefore God's love is the love devoid of passions such as anger, revenge, envy, or guilt; God's love is essentially unconditional love. And that's why David emphasizes this spiritual truth so much, the great King was always a sensible and God-fearing man.
And this love of God is not simply an ideal or aspirational love, but a love that bore fruit in the history of Israel. And Psalm 89, after praising the love of God, did not forget this fact. And so King David recalled in the hymn the blessing of God upon him and his family, a blessing that became a covenant between the creator of all things and the king of Israel, with these words: You said, "I have made a covenant with my chosen one, I have sworn to David my servant, 'I will establish your line forever and make your throne firm through all generations'" Psalm 89:3-4. It is important to note that all the prophecies about the arrival of Jesus made by the prophets begin with this covenant, such as the prophecy about Emmanuel in the Book of Isaiah. Psalm 89 is ultimately a reminder that the Lord is wise and perfect and that, for this reason, men who fear God, like David, are rewarded, a reward that, in David, was transformed by the divine providence into the promise of a savior for Israel and humanity.

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