Theophylact of Ohrid

The lamps are our souls, and each one's mind is also a lamp; the lamp is lit when one has the oil of the virtues and of almsgiving. The virgins were truly foolish in this regard also, that they went to look for oil when it was not the time for work and business. The wise virgins say, "lest there be not enough for us and you." My neighbor's virtue scarcely suffices for his own defense, and certainly not for me as well, for each one will be deemed righteous by his own deeds and not by those of his neighbor. …

Commentary on Matthew ↗

Augustine of Hippo

Note then, beloved, that before those virgins slept, it is not said that their lamps were extinguished. The lamps of the wise virgins burned with an inward oil, with the assurance of a good conscience, with an inner glory, with an inmost charity. Yet the lamps of the foolish virgins were also still burning. In what way were they burning? They burned because there was no lack of praise among human onlookers. But after that they arose, that is, in the resurrection from the dead. …

Sermon 93.8 ↗

Jerome

Then all those virgins arose, and adorned their lamps. All the virgins arose, and each adorned their lamps, that is, their senses, in which they received the oil of knowledge, so that they may have the works of virtue, which would shine before the true judge.

Commentary on Matthew ↗

Gregory the Dialogist

"Then all the virgins rise," because both the elect and the reprobate are awakened from the sleep of their death. "They trim their lamps," because they count up their works with them, for which they expect to receive eternal blessedness. But the lamps of the foolish virgins are extinguished, because their works, which had appeared outwardly bright to men, are inwardly darkened at the coming of the judge. And they find no recompense from God, because for those works they received from men the praises which they loved.

Forty Gospel Homilies, Homily 12 ↗