In 1782 he published the fourth volume of his Institutes, An History of the Corruptions of Christianity, describing how he thought the teachings of the early Christian church had been "corrupted" or distorted.
Pada tahun 1782 ia menerbitkan volume keempat dari Institutes of Natural and Revealed Religion, bertajuk An History of the Corruptions of Christianity, yang menjelaskan bagaimana pemikiran pengajaran gereja Kristen awal yang telah "menyimpang".