September 8 for Orthodox is the Feast of the Nativity of the Theotokos – the birthday of the mother of Jesus.
“Rational man suffered even more, awaiting his liberation. For this reason, mankind offers the highest gift to Christ Who becomes man: His Virgin Mother.
In fact, we men had nothing more honorable to offer God. The Panaghia(‘Pan Aghia’: ‘All Holy Mother of God’) had already offered herself entirely to God, and as a most pure vessel was ready to receive in her womb her Son and her God and so, at her Annunciation, when Archangel Gabriel told her that she would become the Mother of Christ, she could answer with confidence in God: ‘Behold the handmaid of the Lord. Be it unto me according to thy word’ [Luke 1:38].
Moreover, we could not have offered the Virgin Mary to God if she had not offered herself to God. This free offering of the Virgin made the incarnation of God possible, for God would not violate our freedom by becoming incarnate without our own consent. The Virgin was able to stand before God as our representative, and to say ‘Yes’ to God. Her deed is a deed of unique responsibility, of love, and of freedom. She gave God what He Himself did not have – human nature – in order that God might give man what he did not have – deification (theosis). Thus the Incarnation of Christ is not only God’s free act of offering to man, it is also a free offering from man to God through the Virgin.
This mutual freedom is the prerequisite for love. God offers freely without any necessity, and the Virgin accepts the gift freely without compulsion. The Virgin could not co-operate with God if she had established her own egoistic satisfaction at the content of her freedom – rather than her offering to God and man. Moreover, the Virgin is always rightly blessed by all generations of Christians, and especially during these holy days, as the: ‘cause of the deification of all.’ At the same time, she points out the way of true freedom.” (George Capsanis, The Eros of Repentance, pp. 68-70)