Clement of Alexandria

"Every one," he says, "who does righteousness is born of God;" being regenerated, that is, according to faith.

From the Latin Translation of Cassiodorus ↗

Augustine of Hippo

"If ye know that He is righteous, know ye that every one that doeth righteousness is born of Him." The righteousness which at present is ours is of faith. Perfect righteousness is not, save only in the angels: and scarce in angels, if they be compared with God: yet if there be any perfect righteousness of souls and spirits which God hath created, it is in the angels, holy, just, good, by no lapse turned aside, by no pride falling, but remaining ever in the contemplation of the Word of God, and having nothing else sweet unto them save …

Ten Homilies on 1 John 4 ↗

Bede

If you know that he is righteous, know that our righteousness is now by faith. Perfect righteousness is found only in angels, and scarcely in angels if compared to God. However, if any perfect righteousness exists in the souls and spirits that God created among the angels and saints, the righteous and the good, who fell by no lapse, were not brought down by pride, but always remained in the contemplation of God's word and found nothing else sweet except the one from whom they were created, in them is perfect righteousness. …

Commentary on the Catholic Epistles ↗