In this Psalm we find David nailing his colours to the mast. He says God is the one I love, he is the one I follow. I will not surrender, I will not retreat. I will choose to go his way, no matter what battle I face. I will trust him always and I will trust him alone. I will make him my refuge and treasure. And where that is true – when you nail your colours to this mast, to God, he will bring you through life and death to the fullness of joy and pleasures which are everlasting.
David petitions for preservation which leads to exultation in God as refuge, treasure, sovereign and counsellor, which leads to unshaken confidence that he will be preserved, which leads to deep and pervasive joy: “My heart is glad. My whole being rejoices.”