I Tim 2:5 One mediator

from comment 246 http://www.calledtocommunion.com/2013/12/rome-geneva-and-the-incarnations-native-soil/

Regarding the “one mediator” passage of Scripture, the sense in which Christ is the “one mediator” is fully compatible with there being other mediators mediating in senses other than the sense in which Christ mediates. Hence, for example, my interceding for you is not made impossible by Christ’s unique mediation on your behalf. Moreover, we already know that Mary’s fiat (“Let it be to me according to your word” – Luke 1:38) is fully compatible with 1 Tim 2:5, and thus with Christ’s unique mediation. And yet, by her fiat, Mary mediated between God and man, by making way for the union of the divine and human natures in the Person of the Logos. Abraham likewise interceded for the people of Sodom, and Moses did the same for the Hebrews. So the 1 Tim 2:5 passage cannot be interpreted as excluding without qualification all other sorts of mediation between God and man, and thus any other mediators. Rather, it should be interpreted as affirming the uniqueness of Christ’s mediation, as the unique sacrifice that satisfies the justice of God regarding the sin of the world. The doctrine that Jesus is the sole Mediator between God and man is referring to that by which grace is merited for us, and our eternal debt of our sin is paid. Only the God-man Jesus Christ could do that, and has done that. But that does not mean that Christ can use no other person as an instrument by which to bring that grace to us, through their prayers and intercessions; nor does it mean that no one else can aid us with respect to temporal debt; nor does it mean or entail that those who by this grace are united to Him cannot participate in His sacrifice in derivative ways, say, by offering Him to the Father (since the Son gives Himself to us to be offered to the Father), and by offering ourselves and our actions, in union with Christ’s offering, to the Father. concerning communion of the saints: