Psalmist is traditionally teaching that Gods law is eternal. He is pronouncing the eternal death of anyone who morally opposes Gods Law. He proclaims anyone who opposes Gods Law is naturally going to suffer the divine wrath of God in eternity. But the Psalmist is also teaching a specific application of the curse that he typically practices throughout the Psalms. He is teaching that Christ who was equal with the Father in eternity, lowered Himself and took on flesh. We affectionately call this the incarnation. But Christ provided the substitute who took on the curse of the law executed the curses unique enforcement of the law proving He alone has the power over life and death.Christ graciously provided the solitary substitute that would efficiently deliver man from the authoritative pronouncement of death that legitimate rules in the curse.
But Christ also made man a high priest in a substitutionary role as Gods little gods on the earth to pronounce His judgement in the curse of the law. The Psalmist is borrowing Gods pronouncement in the law in the role of Christ kings established in the offspring of King David. Hence, all of the Gods saints are grafted into the old testament Church. We share in the corresponding power on the earth as Christ obtained when He ascended to the throne. The Old Testament is the New Testament concealed. The New Testament is the Old Testament revealed. The curses are contained in Gods judgements and not in mans anger. The curses cannot fail because they consume all the reasons for man to use His own anger to try to bring about the righteousness of God.The curses contain all the destruction of the opposition. We are contained in the righteous indignation of God. The Psalmist designates this being protected in the refuge of God. 

 The Psalmist is saying that pronouncing the eternal curses inseparably unite our anger with Gods just declaration of eternal death to the fierce opposition. So every pronouncement falls out into the limitless potential for God to rush His judgement. He is saying judgement is near, and the curses provide the creation of swift punishment. When the eternal curse is carried out by God in the time sequence then violent man is forced to reluctantly give God respect. The curses are like forcing a snarling dog on a leash. Here in verse 12 the Psalmist demonstrates the divine power of the curses for Gods people as their secure refuge. " Kiss the Son, lest he be angry and you be destroyed in your way,for his wrath can flare up in a moment.Blessed are all who take refuge in him."The inherent pressure is exerted in fierce curses pushing down on Gods opposition.