Luke 16:8

(in Prov. 1:1.) But because the Gentiles say that wisdom is a virtue, and define it to be the experience of what is good, evil, and indifferent, or the knowledge of what is and what is not to be done, we must consider whether this word signifies many things, or one. For it is said that God by wisdom prepared the heavens. (Prov. 3:19.) Now it is plain that wisdom is good, because the Lord by wisdom prepared the heavens. It is said also in Genesis, according to the LXX, that the serpent was the wisest animal, wherein He makes wisdom not a virtue, but evil-minded cunning. And it is in this sense that the Lord commended the steward that he had done wisely, that is, cunningly and evilly. And perhaps the word commended was spoken not in the sense of real commendation, but in a lower sense; as when we speak of a man being commended in slight and indifferent matters, and in a certain measure clashings and sharpness of wit are admired, by which the power of the mind is drawn out. The children of this world also are not called wiser but more prudent than the children of light, and this not absolutely and simply, but in their generation. For it follows, For the children of this world are in their generation wiser than the children of light, &c.

(ubi sup.) The steward whom his Lord cast out of his stewardship is nevertheless commended because he provided himself against the future. As it follows, And the Lord commended the unjust steward, because he had done wisely; we ought not however to take the whole for our imitation. For we should never act deceitfully against our Lord in order that from the fraud itself we may give alms. (ubi sup.) On the other hand this parable is spoken, that we should understand that if the steward who acted deceitfully, could be praised by his lord, how much more they please God who do their works according to His commandment.

The children of light and the children of this world are spoken of in the same manner as the children of the kingdom, and the children of hell. For whatever works a man does, he is also termed their son.

By the children of this world then He means those who mind the good things which are on the earth; by the children of light, those who beholding the divine love, employ themselves with spiritual treasures. But it is found indeed in the management of human affairs, that we prudently order our own things, and busily set ourselves to work, in order that when we depart we may have a refuge for our life; but when we ought to direct the things of God, we take no forethought for what shall be our lot hereafter.