To give this ideal of life concrete expression and to nurture the soul of those who would live it, practical realities naturally led to the development of various worship services and devotions which gave the Moravian communities a character of their own. Each day began and ended with worship, both in smaller groups within the community (divided by age and condition of life) and with the community as a whole. A significant addition to Moravian worship materials was made with the introduction of the "Losungen", or Daily Texts, in 1728. This could be a private devotional, but it assumed corporate congregational importance as well. From the time of the first printed Text Book (1731), Moravians throughout the world have used these texts as a daily devotional guide, either in private devotions or in the brief morning or evening services for the whole congregation or a specific part of it. While the 18th century "Losungen" were generally drawn from Scripture texts, they might also consist of a hymn stanza or a portion thereof. This was characteristic of the Moravian Church, for it was in its hymnody and music that it expressed its theology most frequently and visibly. Zinzendorf encouraged the development of hymn singing. In the early days of Herrnhut, when the community did not yet enjoy a large repertoire of hymns, he conducted singing classes in which not only the hymns, but something of the life and purpose of the author was learned. A large hymnal was produced in 1735 and many more texts were added in its numerous appendices. A slightly more manageable collection was made in 1754 and 1767. In 1778 there appeared the extremely influential hymnbook of Christian Gregor, which remained in use among the German-speaking congregations for about a century. This contained 1750 hymns, 308 of them written or recast by Gregor himself. Gregor’s procedure in compiling these hymns is also instructive: he often took familiar stanzas from originally different hymns and put them together into one hymn, sometimes weaving them together with new stanzas of his own. In 1784, Gregor edited a "Choralbuch" which contained the most-frequently-used tunes for these hymns. In this book he cleaned up and added to a tune numbering system developed earlier in the century – a system by which tunes of the same meter share a number and are distinguished from one another by a letter.