“From that time Jesus began to preach, saying, ‘Repent, for the kingdom of heaven is at hand.”
“Turn from your sins and self-will if you want to gain entrance into the Kingdom of Heaven, where God is the Supreme Ruler of all.”
I think it’s a fair statement that very few Christians ever present the plan of salvation within the context of God’s Kingdom, or the Kingdom of Christ. But that’s exactly what Christ Himself did. Sinners must realize that the Kingdom of Heaven is a literal kingdom where Christ rules as King of kings and Lord of lords. They must realize that we enter that Kingdom the moment we place our faith in Him (Col 1:13).
Therefore, we must conclude that entrance into the Kingdom of Heaven requires the surrender of one’s life to the King who sits on its throne.