Daemonologie

In the book he approves and supports the practise of witch hunting.
He was influenced by his personal involvement in the North Berwick witch trials.
The book is very difficult to read because of it's written in the language of the time period although while reading, the modern words seems to come through quite easily automatically in place of the old english.

Excerpt:
The fearefull aboundinge at this time in this countrie, of these detestable slaues of the Deuill, the Witches or enchaunters, hath moved me (beloued reader) to dispatch in post, this following treatise of mine, not in any wise (as I protest) to serue for a shew of my learning & ingine, but onely (mooued of conscience) to preasse thereby, so farre as I can, to resolue the doubting harts of many; both that such assaultes of Sathan are most certainly practized, & that the instrumentes thereof, merits most severly to be punished: against the damnable opinions of two principally in our age, wherof the one called SCOT an Englishman, is not ashamed in publike print to deny, that ther can be such a thing as Witch-craft: and so mainteines the old error of the Sadducees, in denying of spirits.