This task I would perform in the most perspicuous and most convincing manner I can; for magic, I know, is held to be a very hard and difficult study by those learned, and universally unlawful and diabolical by those unlearned, who believe there is such a science attainable by human genius. On the other hand, by some learned men, who believe there is no such science, it is represented as an inconsistent system of superstitions and chimeras; and again laughed at as such by the unlearned, who are of an incredulous temper; what I would therefore undertake to do in this place is to show the learned men, who believe there is such an art, that the attainment to a tolerable knowledge of the manner how magical practices may be brought about, is no such difficult matter as they have represented it to themselves; and by doing this I shall make the system of it so plain, that while the learned approve of it, the unlearned too, who are not of an unbelieving kind, may understand clearly what I say; and the learned men who have rejected this science as chimerical, may be clearly convinced it is real; and then there is nothing left but obstinate unbelieving ignorance, which I shall not here pretend by arguments to lead into sense, but leave it to the work of time. In fine, I will endeavour to induce men of sense to say, that what has been accounted mysterious, is delivered in a plain, easy, and convincing manner, and to own that they approve, while men of the lower class of understanding shall confess and acknowledge that they themselves understand it; and that what has hitherto been represented as arduous and difficult to a great genius, is adapted and rendered not only clear, but familiar to persons of middling talents. In this work, therefore, I shall follow the strictest order I can, which of all things render a discourse upon any subject the most clear; and that it may be plain to the commonest capacity, I will first set down what order I intend to follow. First, I will speak of magic in general. Secondly, Of magic under its several divisions and subdivisions. Thirdly, Concerning the object of art, as it is good or bad. Fourthly, Of the persons exercising that art in either capacity, of good or bad, and by what means they become capacitated to exercise it. In the fifth place, I shall come to the several objections against the art of magic, and the refutation of those objections. The first objection shall be against the existence of good and bad spirits; the refutation of which will consist in my proving the existence of spirits, both good and bad, by reason and by experience.