In his fifteenth year, during a dangerous illness, he came under the personal influence of Johann Arndt, author of Das wahre Christenthum, and resolved to study for the church.
Of his other valuable works may be mentioned Geschichte der evangelisch-lutherischen Religion, als ein Beweis, dass sie die wahre sei (1753), Entwurf einer vollstdndigen Historie der reimischen Papste (1756, 2nd ed.
Entwurf einer reinbiblischen Theologie appeared in 1792 (2nd ed., 1801), Summa Theologiae Christianae in 1803 (other editions, 1808, 1816, 1830); Das Leben Jesu in 1842, and Die wahre and falsche Orthodoxie in 1849.
Another work, which was soon translated into all the principal European languages, Die wahre Weihe des Zweiflers (1823; 9th ed., with the title Die Lehre von der Siinde and dem Versohner, 1870), the outcome of his own religious history, procured for him the position which he ever after held of the modern Pietistic apologist of Evangelical Christianity.
Burkli (Der wahre Winkelried, - die Taktik der alien Urschweizer, Zurich, 1886) has put forth a theory of the battle which is, he allows, opposed to all modern accounts, but entirely agrees, he strongly maintains, with the contemporary authorities.
Von Baer had gained unanimous support for his dictum, " Die Entwickelungsgeschichte ist der wahre Lichttrager far Untersuchungen Aber organische Korper."
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