Freylinghausen was a student at the University of Jena when he first heard the preaching of Francke. Shortly afterward he followed him to Halle, and in 1695 became Francke's colleague. He preached at vesper services, conducted midweek meetings, taught classes in the orphanage school, and delivered lectures on homiletics. He served without salary for ten years, since Francke was obliged to use all his income for the support of his institutions of mercy. In 1715 Freylinghausen married Francke's only daughter. At her baptism as an infant he had been her sponsor, and she had received his name, Johanna Anastasia. It was after Francke's death in 1727 that the Halle institutions reached their highest development under the direction of Freylinghausen. When the latter died in 1739, he was buried beside his beloved friend. Freylinghausen's "Geistreiches Gesangbuch" became the standard hymn-book of the Pietistic movement. The first edition appeared in 1704 and contained 683 hymns. A second hymn-book was published in 1714, containing 815 additional hymns. The two collections were combined in 1741 by G. A. Francke and published as one hymn-book, containing 1,582 hymns and 600 tunes. Freylinghausen was the author of forty-four of these hymns, and is also said to have composed some of the melodies. The hymns of Freylinghausen are the most worthy of all those produced by the Pietistic school. They are marked by genuine piety, depth of feeling, rich Christian experience, and faithfulness in Scriptural expression. The tunes employed, however, were often a distinct departure from the traditional Lutheran chorales, and were not always suited to congregational worship. Freylinghausen's most famous hymn, "O Jesus, Source of calm repose," was greatly admired by John Wesley, who translated it into English in 1737. The so-called "Jesus hymns," which reached their greatest development among the Pietists, find their sweetest expression in Freylinghausen's: Who is there like Thee, Jesus, unto me? None is like Thee, none above Thee, Thou art altogether lovely; None on earth have we, None in heaven like Thee. It is not strange that from Halle, from whence such mighty missionary influences flowed, should also go forth the first Protestant missionary hymn. It was in 1750 that Karl Heinrich von Bogatzky, while working among the orphans of the Franckean institutions, wrote his famous hymn, "Awake, thou Spirit, who didst fire."