Theophylact of Ohrid

Let us see what he says: "Lord! here is your mina," take it; "I kept it, wrapped in a handkerchief." A cloth was placed on the head of the deceased Lord (John 20:7), and the face of Lazarus in the tomb was wrapped with a handkerchief (John 11:44). Therefore this negligent man rightly says that he wrapped the gift in a handkerchief. For having made it dead and inactive, he made no use of it and brought no profit.

Commentary on Luke ↗

Augustine of Hippo

In the Gospel, you have heard both the reward of the good servants and the punishment of the bad. The fault of that servant who was reproved and severely punished was this and only this: that he would not put to use what he had received. He preserved it intact, but his master was looking for a profit from it. God is greedy for our salvation. If such condemnation befalls the servant who did not use what he had received, what should they who lose it expect? We therefore are dispensers. We expend, but you receive. …

Sermon 94 ↗

Ambrose of Milan

Nothing is said of the other servants, who like wasteful debtors lost all that they had received. By those two servants who gained by trading, are signified that small number, who in two companies were sent as dressers of the vineyard; by the remainder all the Jews. It follows, And they said unto him, Lord, he has ten pounds. And lest this should seem unjust, it is added, For to every one that hath, it shall be given.

Catena Aurea by Aquinas ↗

Bede

And another came, saying: Lord, behold thy pound, which I have kept laid up in a napkin. For I feared thee, because thou art a stern man: thou takest up that thou layedst not down, and reapest that thou didst not sow. The servant who, being ordered to trade, hid the master's money in a napkin, shows those who, although fit to preach, refuse either to take up the office of preaching, by command of the Lord through the Church, or at least to carry it out worthily once taken up. …

On the Gospel of Luke ↗