In 1734 came four tracts of his attacking the common theory of inspiration, arguing that the resurrection of Christ was no proof of his divine mission and criticising the story of Abraham's sacrifice of Isaac. The whole argument showed increasing scepticism, and the assertion about Abraham led to some controversy. He returned to the question in 1735, in some "Observations" on Thomas Rundle's nomination to the Diocese of Gloucester, Rundle having been accused of disbelieving the story. Three tracts were added that continued the former discussion.