THE LORD TOLD THIS PARABLE, “The Kingdom of heaven is like a king who gave a wedding feast for his son. He sent his servants to call those who had been invited to the wedding feast, but they refused to come. Again the king sent other servants, saying, ‘Tell those who have been invited, “Behold, I have prepared my dinner, my oxen and fatted calves have been slaughtered, and everything is ready. Come to the wedding feast.”’ But those who were invited made light of it and went away, one to his farm, another to his business, while the rest seized the king’s servants, mistreated them, and killed them. But when the king heard about it, he was enraged. He sent his soldiers to destroy those murderers, and to burn their city. Then the king said to his servants, ‘The wedding is ready, but those invited were not worthy. Go, therefore, to the crossroads of the highways, and invite everyone you find to the wedding feast.’ So those servants went out into the streets and gathered all whom they found, both good and bad, so the wedding hall was filled with guests. But when the king came in to see the guests, he noticed a man there who was not wearing a wedding garment, and he said to him, ‘Friend, how did you get in here without a wedding garment?’ And the man was speechless. Then the king said to the servants, ‘Bind him hand and foot, take him away, and throw him into the outer darkness where there will be weeping and gnashing of teeth.’ For many are called, but few are chosen.”
Saint Gregory the Great explains what the wedding garment stands for in this parable,
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 fear in our hearts. But the king came in to look at 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? A person is outside because he has not yet come to believe. What then must we understand by the wedding garment but love? That person enters the marriage feast, but without wearing a wedding garment, who is present in the holy Church. 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" (John 3:16).
The Whole Counsel of God Bible study: