Andrew of Caesarea
Although there were many local churches, he sent only to the seven churches. He did this because of the sevenfold number, which mystically signifies all existing churches. It also corresponds to the present life, in which the sevenfold cycle of days is received. For the same reason he mentions only seven Angels and seven churches, to whom he sends his greeting: “Grace to you and peace from the Trihypostatic Godhead.” By the word “He who is,” the Father is signified, who said to Moses, “I am He who is” (Ex 3:14). By the expression “who was,” the Word is signified, who “was in the beginning with God” (Jn 1:1). By the word “who is coming,” the Comforter is signified.
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He always descends upon the children of the Church in holy Baptism and will descend in all fullness in the age to come (Acts ch. 2). By the seven spirits one may understand the seven Angels, who received governance of the churches. They are not numbered together with the God-originating and kingly Trinity, but are mentioned with Her as Her servants. Similarly, the divine Apostle said: “I charge you before God and the Lord Jesus Christ and His elect Angels” (1 Tim 5:21). This may also be understood in another sense. By the expression “He who is and who was and who is to come,” he means the Father, who contains in Himself the beginning, middle, and end of the being of all that exists. By the seven spirits, he means the gifts of the Life-giving Spirit. By the One who is to follow after this, he means Jesus Christ, God, who for our sake became man. For in the Apostle also the divine Hypostases are placed before and after one another without any distinction. Therefore he says here too: “and from Jesus Christ,” and so forth.