The apostles all drew their doctrine in common from personal contact with the divine-human history of the crucified and risen Saviour, and from the inward illumination of the Holy Spirit, revealing the person and the work of Christ in them, and opening to them the understanding of his words and acts. This divine enlightenment is inspiration, governing not only the composition of the sacred writings, but also the oral instructions of their authors; not merely an act, but a permanent state. The apostles lived and moved continually in the element of truth. They spoke, wrote, and acted from the spirit of truth; and this, not as passive instruments, but as conscious and free organs. For the Holy Spirit does not supersede the gifts and peculiarities of nature, which are ordained by God; it sanctifies them to the service of his kingdom.
On his journey he stayed in England and met Edward Pusey and other Tractarians. His inaugural address on The Principle of Protestantism, delivered in German at Reading, Pennsylvania, in 1844, and published in German with an English version by John Williamson Nevin was a pioneer work in English in the field of symbolics (that is, the authoritative ecclesiastical formulations of religious doctrines in creeds or confessions). This address and the "Mercersburg Theology" which he taught seemed too pro-Catholic to some, and he was charged with heresy. But, at the synod at York in 1845, he was unanimously acquitted.
Schaff's broad views strongly influenced the German Reformed Church, through his teaching at Mercersburg, through his championship of English in German Reformed churches and schools in America, through his hymnal (1859), through his labours as chairman of the committee which prepared a new liturgy, and by his edition (1863) of the Heidelberg Catechism. His History of the Apostolic Church (in German, 1851; in English, 1853) and his History of the Christian Church (7 vols., 1858-1890), opened a new period in American study of ecclesiastical history.
In 1854, he visited Europe, representing the American German churches at the ecclesiastical diet at Frankfort and at the Swiss pastoral conference at Basel. He lectured in Germany on America, and received the degree of D.D. from Berlin.
In consequence of the ravages of the American Civil War the theological seminary at Mercersburg was closed for a while and so in 1863 Dr. Schaff became secretary of the Sabbath Committee (which fought the “continental Sunday”) in New York City, and held the position till 1870. In 1865 he founded the first German Sunday School in Stuttgart. In 1862-1867 he lectured on church history at Andover.
Schaff was a member of the Leipzig Historical Society, the Netherland Historical Society, and other historical and literary societies in Europe and America. He was one of the founders, and honorary secretary, of the American branch of the Evangelical Alliance, and was sent to Europe in 1869, 1872, and 1873 to arrange for the general conference of the Alliance, which, after two postponements on account of the Franco-Prussian War, was held in New York in October 1873. Schaff was also, in 1871, one of the Alliance delegates to the emperor of Russia to plead for the religious liberty of his subjects in the Baltic provinces.
He became a professor at Union Theological Seminary, New York City in 1870 holding first the chair of theological encyclopedia and Christian symbolism till 1873, of Hebrew and the cognate languages till 1874, of sacred literature till 1887, and finally of church history, till his death. He also served as president of the committee that translated the American Standard Version of the Bible, though he died before it was published in 1901.
His History of the Christian Church resembled Neander's work, though less biographical, and was pictorial rather than philosophical. He also wrote biographies, catechisms and hymnals for children, manuals of religious verse, lectures and essays on Dante, etc. He translated Johann Jakob Herzog's Real-Encyklopädie für protestantische Theologie und Kirche into English.
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