6 And therefore we ought not to deem ourselves separated from that righteousness, which the Lord Himself makes mention of, saying, “Of righteousness, because I go to the Father.” For we too have risen with Christ, and we are with Christ our Head, now for a while by faith and hope; but our hope will be completed in the last resurrection of the dead. But when our hope shall be completed, then shall our justification be completed also. And the Lord who was to complete it showed us in His Own Flesh (that is, in our Head), Wherein He rose again and ascended to the Father, what we ought to hope for.
For that thus it is written, “He was delivered for our sins, and rose again for our justification.” The world then is convinced “of sin” in those who believe not on Christ; “and of righteousness,” in those who rise again in the members of Christ. Whence it is said, “That we may be the righteousness of God in him.” For if not in Him, in no way righteousness. But if in Him, He goes with us Whole to the Father, and this perfect righteousness will be fulfilled in us. And therefore “of judgment” too is the world convinced, “because the prince of this world has been judged already;” that is, the devil, the prince of the unrighteous, who in heart inhabit only in this world which they love, and therefore are called “the world;” as our conversation is in heaven, if we have risen again with Christ.
Therefore as Christ together with us, that is His Body, is One; so the devil with all the ungodly whose head he is, with as it were his own body, is one. Wherefore as we are not separated from the righteousness, of which the Lord said, “Because I go to the Father;” so the ungodly are not separated from that judgment, of which He said, “Because the prince of this world has been judged already.”
Source: Sermons on Selected Lessons of the New Testament (New Advent)