Why does Jesus say that many will come from the east and west and will take their places at the feast of the kingdom of God in Matthew 8:11?

In the Gospels Jesus frequently compares the Kingdom of God to a banquet. This is one of the final reflections that Jesus concludes after his meeting with the Centurion in Capernaun:
"When Jesus had entered Capernaum, a centurion came to him, asking for help. "Lord", he said, "my servant lies at home paralyzed, suffering terribly".
Jesus said to him, "Shall I come and heal him?"
The centurion replied, "Lord I do not deserve to have you come under my roof. But just say the Word, and my servant will be healed. For I myself am a man under authority, with soldiers under me. I tell this one, "Go", and he goes; and that one, "Come", and he comes. I say to my servant, "Do this", and he does it".
When Jesus heard this, he was amazed and said to those following him, "Truly I tell you, I have not found anyone in Israel with such great faith. I say to you that many will come from the east and the west, and will take their places at the feast with Abraham, Isaac and Jacob in the kingdom of heaven. But the subjects of the kingdom will be thrown outside, into the darkness, where there will be weeping and gnashing of teeth."
Then Jesus said to the centurion, "Go! Let it be done just as you believed it would". And his servant was healing at the moment.", Matthew 8:5-13

When Jesus tells us that the kingdom of God is like a banquet, what he is telling us is that the kingdom of God is joy, life, happiness, peace: "But the fruit of the spirit is love, joy, peace, forbearance, kindness, goodness, faithfulness, gentleness and self-control. Against such things there is no law"; Galatians 5:21-23.
Jesus tells us that the guests to this banquet will come from the east and the west, that is, the message of the Kingdom of God is a universal message, intended for all those who fear God, because God is no respecter of persons: "Blessed are the poor in spirit, for theirs is the kingdom of heaven", Matthew 5:3
The doctrine of the Kingdom of God is fundamentally an ethical message, to live the spiritual gifts is to live ethically because all spiritual gifts are good by definition.
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