The Psalmist is carefully teaching God's faithfulness is founded in His unfailing love. How is it communicated to David? Through the sacred words of the axioms that he pronounces. The law, covenants curses statutes promises, decrees and blessings. This effective communication is not like the social fellowship we genuinely enjoy. These words sufficiently establish God's faithfulness on the earth because they undoubtedly come from the mouth of God. These operative words endure through all generations 

 The axioms of law, covenant, curses,decrees statutes, and promises are the oracles of God's covenant. God will honor the oracles in a promise to His own hurt. This covenant of blessing is an eternal covenant. Covenant faithfulness does not begin with obedience of action but of observing (the root word for obedience) the oracles. God's faithfulness is not secured by our active obedience but by carefully observing His sacred words.Consequently, David is demonstrating faithfulness by the words from his mouth!

How will God set up a mighty throne on earth through all generations?By a sworn covenant! The eternal throne of God was sufficiently established as an eternal counsel. It was the official establishment of His axioms.89:7 In the council of the holy ones God is greatly feared; he is more awesome than all who surround him".God is governing the world similar in the eternal heavens. He is the most high who rules by the axioms. The king is abundantly proving his moral authority by the showing that God rules creation and established kingdoms by His axioms.