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.
1782年、Institutes の4巻目である An History of the Corruptions of Christianity を出版し、原始キリスト教の教えがいかにして「堕落」し歪んでいったかを記した。