3 What mean again His words, “Of righteousness, because I go to the Father”? And first must we enquire, if the world is convinced of sin, why it is also of righteousness? For who can rightly be convinced of righteousness? Is it indeed that the world is convinced of its own sin, but of Christ's righteousness? I do not see what else can be understood; since He says, “Of sin, because they believed not on Me. Of righteousness, because I go to the Father.” They believed not, He goes to the Father. Their sin therefore, and His righteousness. But why would He name righteousness in this only, that He goes to the Father? Is it not righteousness also that He came hither from the Father? Or is that rather mercy, that He came from the Father to us, and righteousness, that He goes to the Father?
Source: Sermons on Selected Lessons of the New Testament (New Advent)