Theophylact of Ohrid

Immediately he who had received the five talents went and traded with them. See the speed with which he acts, not in the least bit negligent, but immediately trading and doubling what he had received. For whether a man be gifted with speech, wealth, the authority of kingship, or any other power or skill, if he desires to benefit not only himself but others as well, he doubles what has been given to him. But he who buries the talent is he who cares only for his own benefit and not for that of others, and he is condemned. …

Commentary on Matthew ↗

Jerome

And he who had received the five talents went and worked with them, and gained five more talents. With the earthly senses, he doubled his knowledge of heavenly things: understanding the Creator through His creation, the incorporeal through the corporeal, the invisible through the visible, the temporal through the eternal.

Commentary on Matthew ↗

Gregory the Dialogist

But he who had received five talents gained another five, because there are some who, although they do not know how to penetrate internal and mystical things, nevertheless for the sake of their intention toward the heavenly homeland teach right things to those they can from those very external things they have received; and while they guard themselves from the wantonness of the flesh and from the pursuit of earthly things and from the pleasure of visible things, they also restrain others from these by admonishing them. …

Forty Gospel Homilies, Homily 9 ↗

Thomas Aquinas

And he that had received the five talents went, etc. Here the use of the gifts is presented, and this with regard to three servants. And first with regard to the first; secondly, with regard to the second; thirdly, with regard to the third. Hence he says and he that had received the five talents went. Here progress in virtue is indicated; Psalm 83:8: they shall go from virtue to virtue. And this is had in Genesis 26:13: he went on growing and increasing. …

Commentary on Matthew ↗