Throughout this series, Jesus has described what life in His Kingdom looks like—what it means to live under His rule and reign. He has called us to a righteousness that surpasses that of the scribes and Pharisees. And now, He closes His sermon with a sobering warning and a gracious invitation, a call to examine whether we truly belong to His Kingdom. There are many today who assume they are right with God simply because they try to live a good life, say the right religious words, got baptized, and joined the church. But not everyone who claims to follow Jesus truly knows Him and are known by Him. The question is this: Do I have real assurance that I belong to the Kingdom of God? Can we have real assurance of our salvation? As Jesus brings His sermon to a close, He contrasts those with a superficial faith with those who have a sincere and saving faith. He warns of self-deception and shows us how to be certain of our place in His Kingdom. In Matthew 7:21-29, Jesus closed His Sermon on the Mount by both warning and inviting people to pursue a sincere faith that brings real assurance in God’s Kingdom.