In Das Wesen des Christenthums (1845; 5th edition, 1865; English translation, 1860), Ullmann explains that
Christianity is independent of the orthodox formulas, and contends that a distinction should be made between
faith and dogmatics. His principal historical works are
Gregor von Nazianz (1825; 3rd edition, 1867) and
Die Reformatoren vor der Reformation (The Reformers before the Reformation, 2 volumes, 1841; 2nd edition, 1866; Eng. trans., 1854). Another well-known work is
Die Sundlösigkeit Jesu (The Sinlessness of Jesus, 1854; English translation 1858 and 1870). ==References==