But after that unutterable nourishment [of being raised in the temple], a most mystical economy of courtship came to pass as regards the Virgin, a strange greeting surpassing speech which the Archangel, descended from above, addressed to her, and disclosures and salutations from God which overturn the condemnation of Eve and Adam and remedy the curse laid on them, transforming it into a blessing. The King of all “hath desired a mystic beauty” of the Ever-Virgin, as David foretold (Ps. 44:11) and, “He bowed the heavens and came down” (Ps. 17:9) and overshadowed her, or rather, the enhypostatic Power of the Most High dwelt in her. Not through darkness and fire, as with Moses the God-seer, nor through tempest and cloud, as with Elias the prophet, did He manifest His presence, but without mediation, without a veil, the Power of the Most High overshadowed the sublimely chaste and virginal womb, separated by nothing, neither air nor aether nor anything sensible, nor anything supra-sensible: this was not an overshadowing but a complete union. Since what overshadows is always wont to produce its own form and figure in whatever is overshadowed, there came to pass in the womb not a union only, but further, a formation, and that thing formed from the Power of the Most High and the all-holy virginal womb was the incarnate Word of God.
… while she alone stood between God and the whole human race, God became the Son of Man and made men sons of God; she made earth heavenly, she deified the human race, and she alone of all women was shown forth to be a mother by nature and the Mother of God transcending every law of nature, and by her ineffable childbirth-the Queen of all creation, both terrestial and celestial. Thus she exalted those under her through herself, and, showing while on earth an obedience to things heavenly rather than things earthly, she partook of more excellent deserts and of superior power, and from the ordination which she received from heaven by the Divine Spirit, she became the most sublime of the sublime and the supremely blest Queen of a blessed race.
… she only is the frontier between created and uncreated nature, and there is no man that shall come to God except he be truly illumined through her, that Lamp truly radiant with divinity, even as the Prophet says, “God is in the midst of her, she shall not be shaken'(Ps. 45:5).
… as it was through the Theotokos alone that the Lord came to us, appeared upon earth and lived among men, being invisible to all before this time, so likewise in the endless age to come, without her mediation, every emanation of illuminating divine light, every revelation of the mysteries of the Godhead, every form of spiritual gift, will exceed the capacity of every created being. She alone has received the all-pervading fulness of Him that filleth all things, and through her all may now contain it, for she dispenses it according to the power of each, in proportion and to the degree of the purity of each. Hence she is the treasury and overseer of the riches of the Godhead. For it is an everlasting ordinance in the heavens that the inferior partake of what lies beyond being, by the mediation of the superior, and the Virgin Mother is incomparably superior to all. It is through her that as many as partake of God do partake, and as many as know God understand her to be the enclosure of the Uncontainable One, and as many as hymn God praise her together with Him. She is the cause of what came before her, the champion of what came after her and the agent of things eternal. She is the substance of the prophets, the principle of the apostles, the firm foundation of the martyrs and the premise of the teachers of the Church . She is the glory of those upon earth, the joy of celestial beings, the adornment of all creation. She is the beginning and the source and root of unutterable good things; she is the summit and consummation of everything holy.
St. Gregory Palamas