2 For what else is the feast, but the service of the soul? And what is that service, but prolonged prayer to God, and unceasing thanksgiving? The unthankful departing far from these are rightly deprived of the joy springing therefrom: for 'joy and gladness are taken from their mouth. ' Therefore, the [divine] word does not allow them to have peace; 'For there is no peace to the wicked, says the Lord,' they labour in pain and grief. So, not even to him who owed ten thousand talents did the Gospel grant forgiveness in the sight of the Lord. For even he, having received forgiveness of great things, was forgetful of kindness in little ones, so that he paid the penalty also of those former things.
And justly indeed, for having himself experienced kindness, he was required to be merciful to his fellow servant. He too that received the one talent, and bound it up in a napkin, and hid it in the earth, was in consequence cast out for unthankfulness, hearing the words, 'You wicked and slothful servant, you knew that I reap where I sowed not, and gather where I have not scattered; you ought therefore to have put my money to the exchangers, and on my return, I should have received my own.
Take therefore the talent from him, and give it to him that has ten talents.' For, of course, when he was required to deliver up to his lord that which belonged to him, he should have acknowledged the kindness of him who gave it, and the value of that which was given. For he who gave was not a hard man, had he been so, he would not have given even in the first instance; neither was that which was given unprofitable and vain, for then he had not found fault. But both he who gave was good, and that which was given was capable of bearing fruit.
As therefore 'he who withholds grain in seed-time is cursed,' according to the divine proverb, so he who neglects grace, and hides it without culture, is properly cast out as a wicked and unthankful person. On this account, he praises those who increased [their talents], saying, 'Well done, good and faithful servant; you have been faithful in a little, I will place you over much; enter into the joy of your Lord.'
Source: Letters (New Advent)