Q: “On Earth as it is in Heaven…” what did Jesus have in mind here for Christian life?
A: Not just for Christian life, but for God's whole intended future. In Jesus, God was launching his project of taking back control of earth. But the way this was done was the way Jesus set out on the Sermon on the Mount, culminating in Jesus' own death and resurrection. Our task is to take forward that project and have our lives shaped by it in the present as we do so.