From The Gospel of Matthew, by Curtis Mitch and Edward Sri, commenting on Matthew 22:1-14
The parable of the wedding feast is about our response to God’s call.
It cautions us first of the dangers of indifference. When the Father invites us into a relationship with his Son, we can either choose to respond or we can quietly decline the invitation and go back to our personal pursuits as though nothing has changed and no new demands have been placed on our lives.
Another danger brought to our attention is indignation. Many people fight the idea that we are all sinners in need of salvation. In such cases, the good news and its call for repentance can seem like a threat to our happiness and our deepest desires for fulfillment in life. This can put us on the defensive and even provoke a hostile response toward those who challenge us with the claims of Christ.
Finally, the parable warns us against incomplete conversion. The man without the wedding garment had neither ignored nor refused the invitation to the feast. But his yes to the call of God was not carried through in his life. He wanted the good things of the kingdom, but not enough to break with his sinful ways and live as a committed disciple.