The kingdom of heaven is both unforgiving and, at its essence, all about forgiveness.
“Get behind me, Satan!” was the response Jesus gave Peter when Peter misunderstood his mission.
This sounds harsh. Maybe it was, maybe it wasn’t.
But then Jesus goes on the reveal why he said this.
To Peter, “You are not setting your mind on the things of God, but on the things of man” (Matthew 16:23).
Peter saw only his immediate world, and he reacted accordingly.
Jesus, on the other hand, was looking into eternity and saw, with a kind of determinism, a world far greater.