2 Kings 4:2

Notice, dearly beloved: as long as that widow had oil in her own vessel, it was not enough for her, and she could not pay her debt. It is true, brothers. If a person loves only himself, he does not suffice for himself, and he does not pay the debt of his sins; but when he begins to pour out the oil of charity on all his friends and neighbors and in fact on all people, then he is able to suffice for himself and can free himself from all debts. Truly brothers, such is the nature of holy love and true charity that it increases by being spent, and the more it is paid out to others, the more abundantly it is accumulated in oneself. If you want to give bodily food to the needy, at present you cannot keep what you have given him; but if you offer the bread of charity to one hundred people, it still remains whole. Even if you give it to a thousand, it stays undiminished for you. In fact, if you want to lavish it on the whole world, you will still lose nothing of it; or rather, not only does it not increase, but also the gain of all those on whom you bestowed it increases manifold for you. For example, you had a single loaf of charity; if you had given it to no one you would have it alone, but if you gave it to a thousand you would have acquired a thousand loaves. So great is the possession of charity that it remains entire for each individual and still can be undiminished for them all. Therefore, if you have given to others, you have lost nothing at all; or rather, not only did you not lose anything but also, as I already said, whatever you have conferred on others you have acquired a hundredfold. For this reason, beloved brothers, realize that the widow was freed from her creditors by nothing else than oil; know also that the Catholic church has been freed from its offenses by no other means than the oil of God's mercy.

Here the Scripture relates the other miracle that Elisha performed in order to help the widow. He made flow into the vessels an amount of oil sufficient to pay the debt of her husband and abundantly multiplied it for the nourishment of her children.From the symbolic point of view three aspects must be observed here: first of all it is said that the widow filled the vessels of her neighbors with an oil that gushed out in her house thanks to a gift of God, because the holy church resembles the widow. In fact, she was not abandoned when her husband ascended to heaven, but she filled the hearts of the Gentiles with the oil of the knowledge of salvation which has multiplied and become abundant in her house thanks to the presence of the Holy Spirit. Moreover, the Gentiles, who were separated before, after being filled with that fat oil, glorified with their lips of cheerfulness that God whom they had ignored before. In the second place, the widow asked for empty vessels and filled with oil those that her children brought to her, both small and large vessels. This signifies the saints who have rejected any worldly passion and are filled with the fat of the holy ointment and the oil of happiness. So their mother, that is, the grace of God gives oil to each of them, both to the great and the little. For God gives his gifts as he likes, so that everything may be ours, as the apostle says: "We must grow up in Christ according to his gift." But those who are weighed down by their intemperance, drunkenness and worldly interests, those who, as the apostle says, walk in the vanity of their spirit and are obscured in their intelligence, those who have lost their hope and have given themselves to the practice of every sort of paganism and covetousness are deprived of this grace. In fact, they do not desire this oil, and if they desire it, they prepare no vessel to be filled with it. In the third place, the rest of the oil, which the dead husband had left to his widow, signifies the mercy that [Christ] had shown to the saints while he lived on earth. Solomon says that he who associates himself with the Lord has mercy for the poor, and [the Lord] will reward him according to his works.