For I came down from heaven, not to do my own will, but the will of him that sent me.
All Commentaries on John 6:38 Go To John 6
Tertullian of Carthage
AD 220
You have (then) the restoration of the entire man, inasmuch as the Lord purposes to save that part of him which perishes, whilst he will not of course lose that portion which cannot be lost, Who will any longer doubt of the safety of both natures, when one of them is to obtain salvation, and the other is not to lose it? And, still further, the Lord explains to us the meaning of the thing when He says: "I came not to do my own will, but the Father's, who hath sent me.".
And it is not His own will, but the Father's, which He has accomplished,