This commentary has been written to help to those who are already praying the Lord's prayer and wish to study it further. It could be used in a study group, or for private spiritual reading. It is not an academic study and no knowledge of New Testament Greek is required. The Lord's prayer is a summary of the New Testament. In it, Jesus addresses God as Father in a way that was and remains utterly new and confident. At the same time, he invites Christians to join him, as adopted sons, in his prayer to the Father. It is one of the very few prayers which all Christians hold in common and, at the same time, no serious scholar doubts that it goes back to words which Jesus himself spoke.