Have just finished reading T.F. Torrance's The Trinitarian Faith. It was a set text in seminary, and this is now my third reading of it, and probably the first time I have grasped the majority of it (the chapter on the Holy Spirit, remains somewhat elusive, rather like the Spirit himself).
I found his brief discussion on p186-7, in relation to the problem of the knowledge of Christ, incredibly helpful. It occurs in a chapter entitled "The Incarnate Saviour", and Torrance has just been speaking of how Christ's incarnation involves the assumption of our weaknesses, and directly preceding this section he is speaking of Christ the impassible taking on our human passibility, in order to redeem our suffering. Then he writes:
"It is basically the same argument that is to be applied to the atoning exchange between ignorance and wisdom in Christ", over against 'Arian' attempts to utilise texts speaking of Jesus' ignorance and growth in wisdom. Torrance quotes Athanasius with approval, 'He incorporated the ignorance of men in himself, that he might redeem their humanity from all its imperfections and cleanse and offer it perfect and holy to the Father' (Ad Serapion 2.9).
This is in contrast to the faltering efforts of some (Hilary, Basil), to speak of an 'economic ignorance', and Didymus, who considered it 'unreal'. He then notes Cyril of Alexandria as the one "who developed the soteriological approach of Athanasius most fully." "It was an economic and vicarious ignorance on our Lord's part by way of deliberate restraint on his divine knowledge throughout a life of continuous kenosis in which he refused to transgress the limits of the creaturely and earthly conditions of human nature".
One final quotation, this is p187:
"Jesus Christ came among us sharing to the full the poverty of our ignorance, without ceasing to embody in himself all the riches of the wisdom of God, in order that we might be redeemed from our ignorance through sharing in his wisdom."