§ 20. When he commenced his labors in Brunswick, he was the youngest member of the “ministerium” of the city, that is, of the college composed of the pastors of the several city churches, all of which at that time strictly adhered to the Lutheran creed. He had long lamented that, in consequence of the infelicity of the times, which caused endless doctrinal controversies, the parties of which were many, Papists, Mystics, Unitarians, Reformed, Lutherans, etc., the attention of many persons was diverted from the practical duties of a Christian life, and directed exclusively to controversies on points of doctrine; the result was, that the understanding was actively exercised, but the heart was not properly affected. Such considerations induced him to write Book I. of his “True Christianity.” It was his object to show that God demands a holy life, proceeding from faith in Christ, and that no jealousy concerning the purity of the creed will atone for the absence of the fruits of the Spirit, as exhibited in the life and conduct of the individual. Hence he insists with a warmth unusual in that excited and controversial age, on repentance, on faith in Christ, and on a holy life. Possibly, the apparently sweeping assertions which occasionally occur in his writings, to the effect that the majority of his contemporaries lacked a heavenly spirit, acquired their sombre hue in consequence of the publicity given to human frailties, and the retirement and shade in which vast numbers of holy men preferred to dwell. His Book I., which constitutes the principal part of the work, was first published in Jena, in the year 1605; a second and improved edition appeared in 1607.