The central parable of the two sons in Matthew 21 serves as a mirror, revealing our own spiritual dishonesty. Are we like the religious leaders, saying 'yes' to God but not following through in our actions? Or are we willing to change our minds and obey, like the first son? This parable reminds us that it's not our words, but our actions that truly reflect our faith. The shocking revelation that tax collectors and prostitutes - the outcasts of society - may enter the Kingdom before the self-righteous should prompt us to reconsider our own prejudices and judgments.