Here he became an instructor in German at Harvard in 1825, and in 1830 obtained an appointment as professor of German language and literature there; but his anti-slavery agitation having given umbrage to the authorities, he forfeited his post in 1835, and was ordained Unitarian minister of a chapel at Lexington in Massachusetts in 1836.
(e) Again, not all dogmatic teachings of the pope are under the guarantee of infallibility; neither his opinions as private instructor, nor his official allocutions, however authoritative they may be, are infallible; it is only his ex cathedra instruction which is guaranteed; this is admitted by everybody.
In 1846 he graduated from Princeton Theological Seminary, and was instructor in Hebrew there in 1846-1849.
Among others Asser, the instructor of Alfred the Great, and Robert Grosseteste, bishop of Lincoln, commented on it.
In as far as regards the instructor and guide thus selected, a more fortunate choice could scarcely have been made.