16 I ask further, Who is this God Who overthrew Sodom and Gomorrha? For the Lord rained from the Lord; was it not the true Lord from the true Lord? Have you any alternative to this Lord, and Lord? Or any other meaning for the terms, except that in Lord, and Lord, their Persons are distinguished? Bear in mind that Him Whom you have confessed as Alone true, you have also confessed as Alone the righteous Judge. Now mark that the Lord who rains from the Lord, and slays not the just with the unjust, and judges the whole earth, is both Lord and also righteous Judge, and also rains from the Lord.
In the face of all this, I ask you Which it is that you describe as alone the righteous Judge. The Lord rains from the Lord; you will not deny that He Who rains from the Lord is the righteous Judge, for Abraham, the Father of the Gentiles— but not of the unbelieving Gentiles— speaks thus: In no wise shall Thou do this thing, to slay the righteous with the wicked, for then shall the righteous be as the wicked. In no wise shall Thou, Who judgest the earth, execute this judgment. This God, then, the righteous Judge, is clearly also the true God.
Blasphemer! Your own falsehood confutes you. Not yet do I bring forward the witness of the Gospels concerning God the Judge; the Law has told me that He is the Judge. You must deprive the Son of His judgeship before you can deprive Him of His true Divinity. You have solemnly confessed that He Who is the only righteous Judge is also the only true God; your own statements bind you to the admission that He Who is the righteous Judge is also true God. This Judge is the Lord, to Whom all things are possible, the Promiser of eternal blessings, Judge of righteous and of wicked. He is the God of Abraham, worshipped by him. Fool and blasphemer that you are, your shameless readiness of tongue must invent some new fallacy, if you are to prove that He is not true God.
Source: On the Trinity (New Advent)