Jesus synthesizes the parable of the wedding banquet in Mark 22: 1-14 and Luke 14: 16-24, with the teaching: "Many are called but a few are chosen." The Kingdom of God is a choice, we are all called to the joy of the Kingdom, but a few enter. The Kingdom of God is the dominion, empire, government of the perfections of God: the empire of wisdom, the domain of eternal life; in other words, the government of the spiritual gifts, of the ethical virtues of man. The Kingdom of God is an ethical doctrine, we are all called to live ethically, that is, to live the spiritual gifts and to participate in this joy, of this wedding.
The parable taught by Jesus refers to how men choose, the parable tells us that a king celebrates his son's wedding and sends his servants to let the guests know, but they refuse to go. The king is God and the son is his wisdom, remember that in the doctrine of the kingdom of God Jesus personifies the word of God: "I am the bread of life" John 6:35. Who are the ones who refuse to go to the king's party?
Those who go against common sense, those who practice the error. This is a clear reference to the natural man, to the man who lives according to the designs of the flesh.
Then the king orders to destroy the city and sends calls to the crossings of the roads to all who find: the wedding room is filled with guests. Then a badly dressed person arrives at the party, which is rejected by the king.
This character in the parable is the person who accepts the word of God, that is, the knowledge of the correct means to live, but lacks of constancy in the practice, this is an allusion to the rational man, the almatic man, the lukewarm person, that is debated between good and evil: "He asked, "How did you get in here without wedding clothes, friend? The man was speechless.
Then the king told the attendants, "Tie him hand and foot, and throw him outside, into the darkness, where there will be weeping and gnashing of teeth."" Matthew 22:12-13
The elect are those who accept to go to the party and are well dressed, they are the people prepared for the kingdom of God, the spiritual men, those who accept the word, retain it and practice it with constancy.
The parable of the wedding banquet is an extension, a continuation of the parables of the sower and the parable of the Good Samaritan, these parables refer fundamentally to human typologies (natural, rational and spiritual man) and to the ways of choosing (we live according to the flesh or we live according to the spirit).