The Joy of Jesus is Gratitude

Ephesians 1:3

Ephesians Presents the inestimable treasures of divine wisdom, the knowledge-surpassing manifestations of God’s love to His people. The book sets forth "the riches of his grace" (Eph. 1:7), yes, "the exceeding riches of his grace" (Eph. 2:7), "the riches of his glory" (Eph. 3:16), and "the unsearchable riches of Christ" (Eph. 3:8). Ephesians contains the fullest opening up of the mystery, or the contents of the everlasting covenant. Here we are shown in greater detail than elsewhere the intimate and ineffable relation of the Church to Christ. Here as nowhere else we are conducted unto and into the "heavenlies." Here are revealed depths which no finite mind can fathom and heights which no imagination can scale.
Paul Bows in Worship
Before Paul proceeded to the orderly development of his wonderful theme, he bowed in worship. As his mind was absorbed with the transcendentally glorious subject on which he was to write, as he contemplated the exceeding riches of God’s grace to His people, his soul was overwhelmed—"lost in wonder, love, and praise." The heart of Paul was too full to contain itself and overflowed in adoring gratitude. That is the highest form of worship, and only in such a spirit can we truly enter into the contents of this epistle. "Blessed be the God and Father of our Lord Jesus Christ, who hath blessed us with all spiritual blessings in heavenly places in Christ" (Eph. 1:3). As a prayer those words may be viewed thus: first, its nature—an ascription of praise; second, its Object—the God and Father of Christ; third, its incitement—our enrichment in Him. Were we to sermonize the verse, our divisions would be (1) The believer’s excellent portion: blessed with all spiritual blessings. (2) The believer’s exalted position: in the heavenlies in Christ. (3) The believer’s exultant praise: "blessed be the God and Father."
What It Means to Bless God.