This letter shows the importance Locke attached to the Conduct, and its intended place within the body of the Essay. Unfortunately he never completed the work, which was finally published only in the Posthumous Works of 1706. The big topic which Locke was only just beginning to open up was that of the 'Ethics of Belief'. Every man, he tells us, should regulate his ascent by the evidence alone - a maxim easier to state than to understand, and easier to understand that to put into practice.

A key text in the history of biblical and historical theology, first published in 1695, John Locke's "Reasonableness" is a document for anyone interested in the progress of Locke's thinking about the laws of nature, morality, religion and the limits of reason. This reprint includes the two Vindications that Locke wrote in response to the attacks of his critics.