Originally published in the Lutheran Observer, Ezra Keller’s letters describing religious life in the midwest include a brief assessment of the jerks. Although the “singular mental phenomenon” had been declining in the western settlements, Keller nonetheless encountered a few jerkers among the Cumberland Presbyterians during a missionary trip through Indiana and Illinois in 1837.
In this state I became acquainted with several ministers of the Cumberland Presbyterian church. I was received by them with the greatest kindness. The friendly correspondents between the editor of our periodical and the editor of theirs has been of much utility. Frequently did I experience “how good and how pleasant it is for brethren to dwell together in unity.” It is to be regretted that all christian denominations do not forget their shiboleths and live in peace and friendship. In this state they have about 30 ordained ministers, 16 licentrates, 1 Synod and 5 Presbyteries. They are distinguished for their piety, humility and zeal. And these are the qualities which make them successful in doing good. It is indeed astonishing how fast their number multiplied.
Source
R. F. Rehmer, ed., “Sheep without Shepherds: Letters from Two Lutheran Traveling Missionaries, 1835–1837,” Indiana Magazine of History 71 (1975): 78–79.