I’m enjoying some thoughts from a Greek Grammar by William Mounce called “Basics of Biblical Greek” (Zondervan 2003). A quote in that work is as follows…
“In some translations of Matthew 18:18, it sounds like Jesus promised His disciples that whatever they bound on earth would be bound in heaven, and whatever they loosed on earth would be loosed in heaven. In other words, they had the power to bind and loose, and Heaven (i.e. God) would simply back up their decrees. But the matter is not quite so simple; the actions described in heaven are future perfect passives-which could be translated “will have already been bound in heaven… will have already been loosed in heaven.” In other words, the heavenly decree confirming the earthly one is based on a prior verdict.
This is the language of the law court. Jewish legal issues were normally decided in Jesus’ day by elders in the synagogue community (later by rabbis). Many Jewish people believed that the authority of Heaven stood behind the earthly judges when they decided cases based on a correct understanding of God’s law. (This process came to be called “binding and loosing.”) Jesus’ contemporaries often envisioned God’s justice in terms of a heavenly court; by obeying God’s law, the earthly court simply ratified the decrees of the heavenly court. In Matthew 18:15-20, Christians who follow the careful procedures of verses 15-17 may be assured that they will act on the authority of God’s court when they decide cases.
Just as we struggle to affirm absolutes in a relativist culture, Christians today sometimes wonder how to exercise discipline lovingly against a sinning member of the church. In this text, Jesus provides an answer: when the person refuses to turn from sin after repeated loving confrontation, the church by disciplining the person simply recognizes the spiritual reality that is already true in God’s sight.
– Craig S. Keener