Blessed be the God and Father of our Lord Jesus Christ, who has blessed us with every spiritual blessing in the heavenly places in Christ, just as He chose us in Him before the foundation of the world, that we should be holy and without blame before Him in love, having predestined us to adoption as sons by Jesus Christ to Himself, according to the good pleasure of His will, to the praise of the glory of His grace, by which He made us accepted in the Beloved. In Him we have redemption through His blood, the forgiveness of sins, according to the riches of His grace. In Him you also trusted, after you heard the word of truth, the gospel of your salvation; in whom also, having believed, you were sealed with the Holy Spirit of promise. - Ephesians 1:3-7;13 (NKJV)
This is so much more than blessings we have received. This is who God says we are. We are blessed! Every marvelous spiritual blessing is assured to each believer in the church in Jesus Christ, for they flow from God's grace, wisdom, and eternal purpose. These blessings include our union with Christ; being seated with Him in the heavenly places. All spiritual gifts and service abilities also flow out of these spiritual blessings that God gives to every believer at the time of salvation.
We are chosen! God chose us meaning we were handpicked by God. We are also predestined! This assures us that we are part of God's plan. He chose and predestined us before the foundation of the world. All of God's blessings are in accord with sovereign predestination, which is purposeful and grounded "in love" and is consistent with the intention of God's will.
We are adopted! Through God's purposeful love, believers are adopted into God's family. We have become His heirs and receive all the rights, privileges, and duties. We are redeemed and forgiven! We have been redeemed by the blood of Christ and forgiven of all our sins, according to the riches of His grace. Grace is God's free favor to the undeserving. Believers are given grace simply because God is gracious.
We have been sealed with the Holy Spirit! When we trusted after hearing the words of truth, the gospel of your salvation; having believed, you were sealed with the Holy Spirit. The Spirit is described as both a seal showing ownership and as a guarantee pointing to future redemption. Though believers have not yet experienced redemption in full, God will bring about final redemption - the deliverance of sinners from the bondage of sin (life in His immediate presence) for all who have received the Spirit.
(These are the spiritual blessings along with my opinion and the teaching from the commentary of the NKJV Holman study Bible).