The disciples ask who is the greatest in the kingdom of heaven. Jesus puts a child in their midst and says that unless they change and become like children they will never enter the kingdom; whoever humbles himself like this child is the greatest, and whoever receives one such child in his name receives him. He warns sternly against causing one of these little ones who believe in him to stumble: it would be better for him to have a great millstone hung around his neck and be drowned in the sea. He commands cutting off at the root whatever causes a fall, even a hand or an eye.
Jesus says not to despise one of these little ones, whose angels always see the face of the Father. He tells the parable of the shepherd who leaves the ninety-nine sheep to look for the one that went astray and rejoices over it more: so the Father does not want any of these little ones to perish.
Then he teaches how to treat a brother who sins. First go and tell him alone; if he does not listen, take one or two others along; if he still refuses, tell it to the church; and if he refuses to listen even to the church, let him be to you as a Gentile and a tax collector. Jesus says that whatever they bind or loose on earth will be bound or loosed in heaven, and that where two or three are gathered in his name, he is there among them.
Peter asks how often he must forgive his brother, up to seven times? Jesus answers up to seventy-seven times, and tells the parable of the servant who owed ten thousand talents to his master. The king, moved with pity, forgives him the whole debt, but that servant finds a fellow servant who owes him a hundred denarii, chokes him and has him thrown into prison. The king, hearing of it, calls him wicked, hands him over to the jailers and concludes that so will the heavenly Father do to those who do not forgive their brother from the heart.