Matthew 25:26

The Lord did not allow that He was a hard man as the servant supposed, but He assented to all his other words. But He is indeed hard to those who abuse the mercy of God to suffer themselves to become remiss, and use it not to be converted.

(Verse 26-28) But his master answered and said to him, 'You wicked and lazy servant, you knew that I reap where I have not sown, and gather where I have not scattered seed. So you ought to have deposited my money with the bankers, and at my coming I would have received back my own with interest. Therefore take the talent from him, and give it to him who has ten talents. For to everyone who has, more will be given, and he will have abundance; but from him who does not have, even what he has will be taken away. And cast the unprofitable servant into the outer darkness. There will be weeping and gnashing of teeth.' The lazy person, because he did not want to double the talent, was condemned in one part to pride, in the other part to negligence. 'If,' he said, 'you had known that I am harsh and cruel, and pursue what is not mine, and reap where I have not sown, why did not such a thought instill fear in you, so that you would know that I would diligently seek what is mine, and give my money, or rather silver, to the moneylenders? For both ἀργύριον, as the Greek word signifies. The words, he said, of the Lord are chaste words, silver tested in the fire, proven to the earth, purified sevenfold (Ps. 11:7).' Therefore, money and silver are the proclamation of the Gospel and a divine message, which should be given to money changers and bankers, that is, to other teachers (which the apostles did, appointing elders and bishops in each province), or to all believers who can double money and return it with interest, so that they may fulfill whatever they have learned in word with actions. […]

This parable was spoken with respect to mercy in alms; but the one that comes after this, to them that neither in money, nor in word, nor in protection, nor in any other things whatever, are willing to assist their neighbors, but withhold all. And wherefore can it be that this parable brings forward a king, but that a bridegroom? That thou mightest learn how close Christ is joined unto the virgins that strip themselves of their possessions; for this indeed is virginity. Wherefore Paul also makes this as a definition of the thing. "The unmarried woman careth for the things of the Lord;" such are his words: and, "For that which is comely, and that ye may attend upon the Lord without distraction. These things we advise," he saith. And if in Luke the parable of the talents is otherwise put, this is to be said, that the one is really different from the other. For in that, from the one capital different degrees of increase were made, for from one pound one brought five, another ten; wherefore neither did they obtain the same recompense; but here, it is the contrary, and the crown is accordingly equal. For he that received two gave two, and he that had received the five again in like manner; but there since from the same beginning one made the greater, one the less, increase; as might be expected, in the rewards also, they do not enjoy the same. But see Him everywhere, not requiring it again immediately. For in the case of the vineyard, He let it out to husbandmen, and went into a far country; and here He committed to them the talents, and took His journey, that thou mightest learn His long-suffering. And to me He seems to say these things, to intimate the resurrection. But here it is no more a vineyard and husbandmen, but all servants. For not to rulers only, nor to Jews, but to all, doth He address His discourse. […]

Hence this servant is immediately answered: "Wicked and lazy servant, you knew that I reap where I did not sow, and gather where I did not scatter; therefore you ought to have given my money to the bankers, and upon my coming I would have received what is mine with interest." The servant is bound by his own words when the master says: "I reap where I did not sow, and gather where I did not scatter." As if he were openly saying: If according to your judgment I even demand what I did not give, how much more do I demand from you what I gave to be distributed; therefore you ought to have given my money to the bankers, and upon my coming I would have received what is mine with interest. To give money to the bankers is to impart the knowledge of preaching to those who are able to exercise it. But just as you see our peril if we withhold the Lord's money, so carefully consider your own peril, dearest brothers, because what you hear is demanded back from you with interest. For in usury, money is received back even though it was not given. For when that which was received is returned, something additional is paid beyond what was received. Consider therefore, dearest brothers, that you will pay interest on this money of the word you have received, and take care that from what you hear you also strive to understand other things which you do not hear, so that by gathering some things from others, you may also learn to do from yourselves those things which you have not yet learned from the mouth of the preacher.

(Hom. in Ev. ix. 4.) So then we see as well the peril of the teachers if they withhold the Lord's money, as that of the hearers from whom is exacted with usury that they have heard, namely, that from what they have heard they should strive to understand that they have not heard.