We can now understand why the Lord's Prayer is used twice in the same Service. The Praises begin with it and the Prayers begin with it. The setting of {17} the Lord's Prayer will always proclaim what kind of Service is beginning[1]. Thus the Lord's Prayer is made to strike the key-note of the Service, or part of a Service, to which it is prefixed. e. Forms of Worship. We have seen that Unity of Intention is necessary to congregational worship. When a few people, animated by the same sentiments, are drawn together by one motive, and incur the same dangers, it matters little whether they use a form of worship or not. Whatever words are used in their name, their unity of intention is secured by the fact that they have no diversity of desires. If the small body becomes a large one and times grow peaceful, diversity of desires will destroy unity of worship unless they adopt a form. Forms of worship should, if possible, unite the most diverse features of character, occupation, danger, trial, suffering, joy, &c. in the expressions of Praise or Prayer which are common to them all. Local colouring and personal references are admissible only when they arouse a common emotion. The Lord's Prayer {18} is in this, as in other respects, an ideal Form of Worship. Christian Worship began amongst people who were already accustomed to Forms. The Jews had Psalms for Worship (1 Chron. xvi. 4-43), and two Lessons in their Synagogue Service (Acts xv. 21, First Lesson: Acts xiii. 27, Second Lesson). The two Lessons were followed by the Exhorter (Acts xiii. 15; St Luke iv. 16, 17). The word _Amen_, being Hebrew, gives further evidence of the derivation of the first Christian forms from the Synagogue Services, with, of course, a Christian character infused into them (1 Cor. xiv. 15, 16; cf. Deut. xxvii. 15-26). Amen, as a Hebrew adjective, means _firm, faithful_; and, as an adverb, _verily_, or, as the Catechism explains it, _so be it_. "Its proper place is where one person confirms the words of another, and adds his wish for success to the other's vows and predictions" (Gesenius). Each of the first four Books of the Psalms ends with it--see Psalms xli., lxxii., lxxxix., cvi.