Ps 65 1 Praise awaits you, O God, in Zion;
to you our vows will be fulfilled.
2 O you who hear prayer,
to you all men will come.
3 When we were overwhelmed by sins,
you forgave our transgressions.
4 Blessed are those you choose
and bring near to live in your courts!
We are filled with the good things of your house,
of your holy temple".

The covenant keeping God speaks from Zion. Because God is faithful then we are faithful to our vows. He is saying that God establishes His law in Zion. This law establishes Gods government. It was necessary for Christ to be the law keeper so that He could be the head of the covenant. So this is the government in which we live by atonement. This is why Ive been saying that Gods law becomes our defense. We begin a different relationship to the law. He is saying that our rebellion against the lawful authority in this kingdom has been covered by atonement. We have become one with the law keeper.
We are taught that when we are saved God no longer marks our sin. How can you price righteousness if there is not longer wickedness to your account? We must be enabled to use the law as our defense. If God still marks our sins then we cannot be defended by the law. The law would mark our sin. This is where most people present our position as being under the law but being in Christ. But the Psalmist uses the law to curse the wicked. Some people teach that the Psalmist must be legally justified in himself in order to be in position to speak judgement. But isnt the Psalmist in need of atonement? And we taught here that we sin continuously. This sin is one of the more defiant sins. Its a sin against lawful government of God. The context is our innocence by atonement in our use of the law of God.
So we go from being under the law as a school master to being defended by the law in order to stand in the position of blessing. He is saying that because God continuously atones for our lawful rebellion to His kingdom that we are the recipients of His goodness or blessing. Where does the Psalmist say that Gods blessing is given upon confession or repentance from the condemnation of the law?
The Psalmist is using alternation through this first verse. Gods covenant faithfulness is voiced from Zion..our covenant faithfulness is dependent upon Gods. Its interchangeable. Our need for blessing is by atonement. Atonement is the same as all good things that we receive in the blessing. Out of atonement comes blessing. The curse has been lifted and the law becomes our defense. Grace is valuable by the our power to put to death the opposition in the curse and by the blessing that flows to us that is free