11 But they say, “Not so, lest there be not enough for us and you, but go ye rather to them that sell, and buy for yourselves.” This was not the answer of those who give advice, but of those who mock. And why mock they? Because they were wise, because wisdom was in them. For they were not wise by ought of their own; but that wisdom was in them, of which it is written in a certain book, she shall say to those that despised her, when they have fallen upon the evils which she threatened them; “I will laugh over your destruction.” What wonder then is it, that the wise mock the foolish virgins? And what is this mocking?
12. “Go to them that sell, and buy for yourselves:” ye who never were wont to live well, but because men praised you, who sold you oil. What means this, “sold you oil”? “Sold praises.” Who sell praises, but flatterers? How much better had it been for you not to have acquiesced in flatterers, and to have carried oil within, and for a good conscience-sake to have done all good works; then might ye say, “The righteous shall correct me in mercy, and reprove me, but the oil of the sinner shall not fatten my head.” Rather, he says, let the righteous correct me, let the righteous reprove me, let the righteous buffet me, let the righteous correct me, than the “oil of the sinner fatten mine head.” What is the oil of the sinner, but the blandishments of the flatterer?
13. “Go ye” then “to them that sell,” this have you been accustomed to do. But we will not give to you. Why? “Lest there be not enough for us and you.” What is, “lest there be not enough”? This was not spoken in any lack of hope, but in a sober and godly humility. For though the good man have a good conscience; how knows he, how He may judge who is deceived by no one? He has a good conscience, no sins conceived in the heart solicit him, yet, though his conscience be good, because of the daily sins of human life, he says to God, “forgive us our debts;” seeing he has done what comes next, “as we also forgive our debtors.” He has broken his bread to the hungry from the heart, from the heart has clothed the naked; out of that inward oil he has done good works, and yet in that judgment even his good conscience trembles.
Source: Sermons on Selected Lessons of the New Testament (New Advent)