Ps 136 1Give thanks to the LORD , for he is good.
His love endures forever.
2Give thanks to the God of gods.
His love endures forever.
 3Give thanks to the Lord of lords:
His love endures forever. "

God created all things to bring Himself glory. There is nothing in creation that can change Gods purposes or attributes. God has determined the beginning and the end of all things. Because God can do as He pleases then His love is based upon His decisions. So the Psalmist is teaching that Gods decisions are not made arbitrarily or in reaction to the creation. But God love is based upon His justice, faithfulness, kindness, graciousness, long-suffering and gentleness. So God is limited to act according to His law, covenants, curses, statutes, decrees and promises. God planned and worked in the history of Israel in relating to His people through the axioms. God has displayed His works according to the revealed axioms so that His elect would be able to rule the creation through speaking the axioms.

If God means what He says then His love cannot be contained by the time sequence. If Gods eternal love was only a hope that was clouded in mystery then His love would only be emotional. But Gods eternal love is shown by His works on behalf of His people. In order for God to show His eternal love His word cannot be thwarted. In order for Gods elect to have confidence in God , He must act in concert with His revealed word. In order for Gods elect to fulfill their purpose in ruling creation, they must act in concert with the axioms. If God could not sovereignly decide the actions of men then we could not trust in what He says. If God could not act in concert in pronouncing His word then we would not have confidence that Gods means what He says. So the Psalmist is teaching that God has shown His unfailing love by ruling over all things and blessing His elect with the authority to rule by the pronouncements. So the thankfulness and the eternal love are the holistic expression of speaking the law, covenants, statutes etc.

The Psalmist is teaching that all the events of the world are never created outside of the axioms. So when He praises Gods eternal love , He is saying that God is always the same in His justice, faithfulness ect. When we speak the axioms we ascend to the line of blessing and cursing and experience the unity of all things working together by the axioms. It is an expression that Gods unfailing love does not change by anything outside of God. So Gods axioms can be fully trusted.