8 The proposing of the question pleases you. May God grant His aid, that its solution may please you too. See, what I am asking Him, that He would free both me and you. For in one faith do we stand in the Name of Christ; and in one house do we live under one Lord, and in one body are we members under One Head, and by One Spirit are we quickened. That the Lord then may set both me who speak, and you who hear, free from the straits of this most perplexing question, I say as follows: The Son indeed and not the Father was born of the Virgin Mary; but this very birth of the Son, not of the Father, was the work both of the Father and the Son.
The Father indeed suffered not, but the Son, yet the suffering of the Son was the work of the Father and the Son. The Father did not rise again, but the Son, yet the resurrection of the Son was the work of the Father and the Son. We seem then to be already quit of this question, but perhaps it is only by words of my own; let us see whether it is not as well by words divine. It is my place then to prove by testimonies of the sacred books, that the birth, and passion, and resurrection of the Son were in such sort the works of the Father and the Son, that whereas it is the birth, and passion, and resurrection of the Son only, yet these three things which belong to the Son only, were wrought neither by the Father alone, nor by the Son alone, but by the Father and the Son.
Let us prove each several point, you hear as judges; the case has been already laid open; now let the witnesses come forth. Let your judgment say to me, as is wont to be said to pleaders in a cause, “Establish what you promise.” I will do so assuredly, with the Lord's assistance, and will cite the books of heavenly law. You have listened to me attentively while proposing the question, listen now with still more attention while I prove my point.
Source: Sermons on Selected Lessons of the New Testament (New Advent)