John Chrysostom

"But go to them that sell, and buy." And who are they that sell? The poor. And where are these? Here, and then should they have sought them, not at that time. Seest thou what great profit arises to us from the poor? shouldest thou take them away, thou wouldest take away the great hope of our salvation. Wherefore here must we get together the oil, that it may be useful to us there, when the time calls us. For that is not the time of collecting it, but this. Spend not then your goods for nought in luxury and vainglory. …

Homily on the Gospel of Matthew 78 ↗

Augustine of Hippo

"But the wise replied, 'Perhaps there will not be enough for us and for you; go rather to the dealers and buy for yourselves.' " This is hardly the voice of those who give counsel but rather those who rebuke. Why are they scornful? Because they were wise, because wisdom was in them. For they were not wise by anything that belonged to them. …

Sermon 93.8-9 ↗

Jerome

The wise men answered, saying: Lest perhaps there may not be enough for us and for you. They respond, not out of greed, but out of fear. For each one will receive a reward according to his deeds, and on the day of judgment, the virtues of some cannot mitigate the vices of others. And just as during the Babylonian captivity, Jeremiah could not help the sinners, and it is said to him: Do not pray for this people (Jeremiah 7:16): so fearful will be that day, when each one will be concerned for himself. …

Commentary on Matthew ↗

Gregory the Dialogist

Hence they also immediately add by way of rebuke: "Go rather to those who sell, and buy for yourselves." For the sellers of oil are flatterers. For those who, when any grace has been received, offer the brightness of glory through their vain praises, as it were sell oil. Concerning this oil indeed the Psalmist says: "But let not the oil of the sinner anoint my head." For our principal part is the head. And by the term "head" is meant the mind which rules the body. …

Forty Gospel Homilies, Homily 12 ↗