Matthew 18
The Community Discourse addresses the internal life of the kingdom community with a child placed in the disciples' midst as the teaching's center. The child illustrates the requirement for becoming great in the kingdom (becoming like a child, humble), the definition of the greatest (servant of the little ones), the seriousness of causing a little one to stumble (better a millstone), and the Father's will that none of these little ones be lost. The parable of the lost sheep (the ninety-nine left for the one) grounds the pastoral principle in the Father's own character. The discipline procedure (direct confrontation, then two or three witnesses, then the community, then exclusion) establishes the congregation as the court of final appeal for community disputes, with the binding and loosing authority confirming the community's decisions on earth as bound in heaven. Peter's question about forgiveness — how many times, seven? — receives the seventy-seven times answer and the parable of the unmerciful servant who was forgiven a debt of ten thousand talents but would not forgive a debt of a hundred denarii, making the chapter's theological conclusion: the forgiven must forgive, or the forgiveness they received will be revoked.
Matthew 18:34
And in anger his master delivered him to the jailers, until he should pay all his debt. The reversal of the forgiveness: the master who forgave the debt in pity now delivers the unforgiving servant to the jailers for the full debt. The anger that drives the reversal is the anger of violated covenant relationship — the king who forgave generously is not receiving the gratitude and imitation that the generosity deserved.
Matthew 18:35
So also my heavenly Father will do to every one of you, if you do not forgive your brother from your heart. The application of the parable to the Community Discourse's forgiveness teaching: the heavenly Father will treat the unforgiving disciple as the king treated the unforgiving servant. The from your heart communicates that the forgiveness must be genuine — not merely verbal, not merely procedural, but from the heart. The Community Discourse that began with the question of who is greatest ends with the question of whether those who have been forgiven will forgive.
Matthew 18:33
And should you not have had mercy on your fellow servant, as I had mercy on you? The rhetorical question — should you not have had mercy — is the kingdom's logic of received mercy producing extended mercy. The mercy that the king showed must produce the same mercy in the one who received it. The failure to extend the received mercy is the wickedness that triggers the reversal.
Matthew 18:2
And calling to him a child, he put him in the midst of them. The child called into the center of the disciples' conversation is the visual answer to the greatness question. The child placed in the middle — not pushed to the periphery — is the center of the kingdom's vision of greatness. The action precedes the words: Jesus shows the answer before he explains it.