Epistle of Barnabas : That the Black One may find no means of entrance, let us flee from every vanity, let us utterly hate the works of the way of wickedness. Do not, by retiring apart, live a solitary life, as if you were already [fully] justified; but coming together in one place, make common inquiry concerning what tends to your general welfare. For the Scripture saith, "Woe to them who are wise to themselves, and prudent in their own sight!" — The Epistle of Barnabas, Chapter IV Gregory the Dialogist : Consider as your superiors one another, especially those who are not committed to your charge, your neighbors, because even those whom you see doing certain wicked things—you do not know what good things may lie hidden in them. Therefore let each one strive to be great, but yet in some way not know that he is, lest while he arrogantly attributes greatness to himself, he lose it. For hence it is said through the prophet: "Woe to you who are wise in your own eyes, and prudent before yourselves." Hence Paul says: "Be not wise in your own eyes." Hence against the proud Saul it is said: "When you were little in your own eyes, you were made head among the tribes of Israel." As if it were openly said: When you saw yourself as little, I made you great above others. But because you now see yourself as great, you are esteemed little by me. — Forty Gospel Homilies, Homily 7 Jerome : Who is the greatest subverter of the people of God—he who, relying on the power of free choice, despises the help of the Creator and is satisfied with following his own will, or he who dreads to be judged by the details of the Lord's commandments? — Against the Pelagians 2.7 Jerome : (Verse 21.) Woe to those who are wise in their own eyes, and shrewd in their own sight. For it is said, you yourselves appear to be wise, who follow human wisdom, not God's: and since you do not receive the power of God and the wisdom of God, you think you are wise (1 Corinthians 1). The Stoics claim that there is a difference between wisdom and prudence, in that wisdom is the knowledge of divine and human things, while prudence pertains only to mortal affairs. Furthermore, these things are said against the scribes and Pharisees, who, having the key of knowledge, neither enter themselves nor allow others to enter to Christ (Luke 11). — Commentary on Isaiah