Two parables directed against the religious leaders indicated why they would lose their management of the kingdom, and why others would take their place.
Before Jesus left this earth, he entrusted the gospel ministry to the apostles, but to whom did the apostles entrust it before they departed?...
Jesus told more parables to show that the kingdom of God is free to enter but demands everything.
It is hard to imagine what the world would be like without Saul of Tarsus (the apostle Paul), but it would have been harder...