Very well, then - teach us.
In order to appreciate exactly the import of Mary’s obviously free consent at the Annunciation we need to know first to what she is being asked to consent. Gabriel says "Thou shalt conceive in thy womb, and shalt bear a son, and shalt call him Jesus. He shall be great, and men will know him for the Son of the Most High, the Lord God will give him the throne of his father David, and he shall reign over the house of Jacob eternally (Luke 1:31-41).
To this Mary, by her own free will, responded “Yes.” She consented to be the Theotokos, the Mother of God.
Now, you may ask, what does Mary being the Mother of God have to do with the topic. How do we get from Mary being God’s Mother to her being the Co-Redemptrix? Simply put, can you see how by the fact of Mary agreeing to the Incarnation of the Savior of the world she was co-operating with God’s plan of salvation for all of mankind?
It forms part of the Church’s treasure of faith, explicitly handed down from the earliest times, that Mary is the cause of our salvation, not only because the Savior was born of her, but because, as the New Eve, she contributed to it by her own actions. All Catholics are therefore agreed on this point that Mary was Jesus’ collaborator.
Two phases are to be distinguished in the work of redemption: that of Jesus’ life on earth which is called the phase the winning of grace, of objective salvation, or better still, of general causality of salvation. The other phase can then be called that of the distribution of grace, the subjective redemption, but it might be better to call it the phase of application of the general causality of salvation.
Everyone accepts Mary’s co-operation with respect to this latter phase, inasmuch as by her powerful intercession, she is called distributor of grace under Jesus. As regards the earthly period, all are agreed that she co-operated with Jesus, by:
(a) meriting the putting forward (in time) of the Incarnation
(b) meriting to be the instrument of the Incarnation
(c) freely accepting to be the Mother of God
(d) bearing, bringing up and preparing Jesus for His sacrifice
(e) enduring with Him the suffering by which He saved us
Are you with me so far?
(cont.)