God’s holy ones are worshipped as partakers of the divine nature

And “God stood in the synagogue of the gods; in the midst of it He points out the gods.” (Ps. 82.1) As, then, they are truly gods, not by nature, but as partakers of God’s nature, so they are to be worshipped, not as worshipful on their own account, but as possessing in themselves Him who is worshipful by nature. Just in the same way iron when ignited is not by nature hot and burning to the touch, it is the fire which makes it so. They are worshipped as exalted by God, as through Him inspiring fear to His enemies, and becoming benefactors to the faithful. It is love of God which gives them their free access to Him, not as gods or benefactors by nature, but as servants and ministers of God. We worship them, then, as the king is honoured through the honour given to a loved servant. He is honoured as a minister in attendance upon his master— as a valued friend, not as king. The prayers of those who approach with faith are heard, whether through the servant’s intercession with the king, or whether through the king’s acceptance of the honour and faith shown by the servant’s petitioner, for it was in his name that the petition was made. Thus, those who approached through the apostles obtained their cures. Thus the shadow, and winding-sheets, and girdles of the apostles worked healings. (Acts 5.15) Those who perversely and profanely wish them to be adored as gods are themselves damnable, and deserve eternal fire. And those who in the false pride of their hearts disdain to worship God’s servants are convicted of impiety towards God. The children who derided and laughed to scorn Elisseus bear witness to this, inasmuch as they were devoured by bears. (II Kgs. 2.23)

…I venerate and worship angels and men, and all matter participating in divine power and ministering to our salvation through it.

…No one should be worshipped as God except the one true God. Whatever is due to all the rest is for God’s sake.

St. John Damascene
Apology Against Those Who Decry Holy Images
Part III, What We Find Worshipped in Scripture

The Saints are deserving of honor

For if the friends of Christ are heirs of God and co-heirs of Christ, and are to be partakers of the divine glory and kingdom, is not even earthly glory due to them? I call you not servants, our Lord says; you are my friends. Shall we, then, withhold from them the honor which the Church gives them?

St. John Damascene
Apology Against Those Who Decry Holy Images
Part II

Christ has deified our flesh

From the time that God the Word became flesh He is as we are in everything except sin, and of our nature, without confusion. He has deified our flesh for ever, and we are in very deed sanctified through His Godhead and the union of His flesh with it.

St. John Damascene
Apology Against Those Who Decry Holy Images
Part I

The images of the Saints are honored in the Church

We depict Christ as our King and Lord, and do not deprive Him of His army. The saints constitute the Lord’s army. Let the earthly king dismiss his army before he gives up his King and Lord. Let him put off the purple before he takes honor away from his most valiant men who have conquered their passions. For if the saints are heirs of God, and co-heirs of Christ, (Rom. 8.17) they will be also partakers of the divine glory of sovereignty. If the friends of God have had a part in the sufferings of Christ, how shall they not receive a share of His glory even on earth? “I call you not servants,” our Lord says, “you are my friends.” (Jn. 15.15) Should we then deprive them of the honor given to them by the Church?

St. John Damascene
Apology Against Those Who Decry Holy Images
Part I

Christ’s flesh was unchangeably also God

St John, who rested on His breast, says, that “we shall be like to Him” (I Jn. 3.2): just as a man by contact with fire becomes fire, not by nature, but by contact and by burning and by participation, so is it, I apprehend, with the flesh of the Crucified Son of God. That flesh, by participation through union with the divine nature, was unchangeably God, not in virtue of grace from God as was the case with each of the prophets, but by the presence of the Fountain Head Himself.

St. John Damascene
Apology Against Those Who Decry Holy Images
Part I

Christ elevates human nature to godhood

I adore one God, one Godhead but three Persons, God the Father, God the Son made flesh, and God the Holy Ghost, one God. I do not adore creation more than the Creator, but I adore the creature created as I am, adopting creation freely and spontaneously that He might elevate our nature and make us partakers of His divine nature.

St. John Damascene
Apology Against Those Who Decry Holy Images
Part I

We are made gods by grace and not by any property of our own

Well, then, you say, we ourselves at that rate possess nothing of God. But indeed we do, and shall continue to do—only it is from Him that we receive it, and not from ourselves. For we shall be even gods, if we, shall deserve to be among those of whom He declared, “I have said, Ye are gods,” and, “God standeth in the congregation of the gods.” But this comes of His own grace, not from any property in us, because it is He alone who can make gods.

Tertullian
Against Hermogenes
Chapter V

The Holy Spirit enables man to fulfill his calling as a creature of God

The Christian Church lives by the Holy Spirit. The Spirit alone is the guarantee of God’s Kingdom on earth. He is the sole guarantee that God’s life and truth and love are with men. Only by the Holy Spirit can man and the world fulfill that for which they were created by God. All of God’s actions toward man and the world—in creation, salvation and final glorification—are from the Father through the Son (Word) in the Holy Spirit; and all of man’s capabilities of response to God are in the same Spirit, through the same Son to the same Father.

Thomas Hopko
From the Series: The Orthodox Church
Volume I – Doctrine and Scripture: The Symbol of Faith

God became man so man might learn to act as god

God held converse with man, that man might learn to act as God. God dealt on equal terms with man, that man might be able to deal on equal terms with God. God was found little, that man might become very great. You who disdain such a God, I hardly know whether you ex fide believe that God was crucified.

Tertullian
The Five Books Against Marcion, Book II
Chapter XXVIII