Why don't 5 Virgins Share Their Oil?

Here are the quotes from Church Fathers that St. Thomas has in his "Catena Aurea":

St. Hilary of Poitiers: "The “oil” is the fruit of good works, the “vessels” are the human bodies in whose inward parts the treasure of a good conscience is to be laid up."

St. Jerome: "The virgins that have oil are they who, besides their faith, have the ornament of good works—they that have not oil, are they that seem to confess with like faith, but neglect the works of virtue."

St. John Chrysostom: "The “oil” denotes charity, alms, and every aid rendered to the needy"

St. Gregory the Great: "both elect and reprobate are roused from the sleep of death; they “trimmed their lamps,” that is, they reckon up to themselves their works for which they look to receive eternal blessedness."

St. Augustine: "They “trimmed their lamps,” that is, prepared to give an account of their deeds."

St. John Chrysostom: "The wise answered, saying, “Not so, lest there be not enough for us and you;” hence we learn that none of us shall be able in that day to stand forth as patron of those who are betrayed by their own works, not because he will not, but because he cannot."