In the familiar doings of Mary and Zacharias, found in the opening chapters of Luke, we may trace the beginnings of the hymn literature of the early Christian Church, a literature which later became one of the Church's most valued possessions. If the canon of the New Testament had been closed in 1000 instead of 400 A.D., its books would doubtless have included a hymnal which would have corresponded closely to the Psalter of the Old. Just as the Psalms represent the application of the great doctrines of the Hebrew prophets in the spiritual life of the community, so this new hymnal would represent the personal application of the teachings of Jesus and the apostles to the religious life of the Church and the individual. The Psalter is also what it is because its background is a period of stress and severe trial. In the hot furnace of affliction and persecution the psalmists learned to appreciate the truths which they so confidently and effectively proclaim. Then the spiritual teachings of the earlier prophets, which were contemptuously rejected by their contemporaries, were at last appropriated by the community. The Psalter as a whole appears, therefore, to be one of the latest and most precious fruits of the divine revelation recorded in the Old Testament. [Sidenote: _Evidence of distinct collections of psalms_] In its present form, the Psalter is divided into five books or collections. At the end of each collection there is a concluding doxology (xli., lxxii., lxxxix., cvi). The last psalm (cl.) serves as a concluding doxology, not only to the fifth collection, but also to the Psalter as a whole. Certain psalms are also reproduced in two different collections with only slight variations. For example, xiv. is practically identical with liii., except that in the first _Jehovah_ is always used as the designation of the Deity, and in liii. _Elohim_ or _God_; again Psalm xl. 13-17 is reproduced in lxx.; lvii. 7-11 and lx. 5-12 are together practically equivalent to cviii. These and kindred facts indicate that the Psalter, like the book of Proverbs, is made up of collections originally distinct. The division into exactly five groups appears to be comparatively late, and to be in imitation of the fivefold division of the Pentateuch. [Sidenote: _The oldest collection_]