Nothing escaped the observation of these men, and from beginning to end they emphasized the important truth that religion and the daily life are inseparable. From giving simple practical precepts, the wise men rose to speculation, and the books of Job and Ecclesiastes bear witness that they busied themselves with no mean problems. Of profound significance is also the devotional literature of the Old Testament. In a real sense the entire Old Testament is a book of devotion. It is the outgrowth of a spirit of intense devotion to Jehovah, and it has helped in all ages to nurture the devotional spirit of its readers. Here, however, the term "devotional" is used in the narrower sense of those poetic compositions which are primarily the expressions of the religious experience or emotions of the authors, generated {18} and fostered by their intimate fellowship with Jehovah. The chief representative of this literature is the book of Psalms, which is aptly described by Johannes Arnd in these words: "What the heart is in man, that is the Psalter in the Bible." The Psalms contain in the form of sacred lyrics the outpourings of devout souls--prophets, priests, kings, wise men, and peasants--who came into the very presence of God, held communion with him, and were privileged to hear the sweet sound of his voice. No other literary compositions lift us into such atmosphere of religious thought and emotion. Because these lyrics reflect personal experiences they may still be used to express emotions of joy, sorrow, hope, fear, anticipation, etc., even by persons who live on a higher spiritual plane than did the original authors.