“Since you have already come into the house of the marriage feast, our holy church, as a result of God’s generosity, be careful, my friends, lest when the King enters he find fault with some aspect of your heart’s clothing. We must consider what comes next with great awe. The king came in to meet the guests and saw there a person not clothed in a wedding garment. What do we think is meant by the wedding garment, dearly beloved? For if we say it is baptism or faith, is there anyone who has entered this marriage feast without them? No, all at the feast have come to believe. What then must we understand by the wedding garment but love? The person in the parable wishes to enter the marriage feast, but without wearing a wedding garment–love. He may have faith, but he does not have love. We are correct when we say that love is the wedding garment because this is what our Creator himself possessed when he came to the marriage feast to join the church to himself. Only God’s love brought it about that his only begotten Son united the hearts of his chosen to himself. John says that “God so loved the world that he gave his only begotten Son for us.”
Gregory the Great (c. 540-604), Forty Gospel Homilies, 38.