Whosoever therefore will bee a true Searcher of this sacred Science must of necessity know the Accidents, and an Accident it self, that hee may learn to what subject, or Element hee purposeth to come to, that through mediums hee may apply himselfe to that, if otherwise hee desire to fill up the number of four. For as these three Principles were produced of four, so also by diminution must these three produce two, Male, and Female; and two produce one incorruptible thing, in which those foure shall being equally perfect, be purified, and digested to the utmost; and so a quadrangle shall answer a quadrangle. And this is that quintessence, which is very necessary for every Artificer, being separated from many contraries. And so thou hast in these three Principles, in what naturall composition soever, a body, a spirit, and an occult soule; which three, if thou shalt joine them together being separated, and well purified, as wee said before, without doubt will by imitating Nature yeeld most pure fruit. For although the soule be taken from a most noble place, yet it cannot come whither it tends but by a spirit, which is the place, and mansion of the soule; which if thou wilt reduce to its due place, it is necessary that it be washed from all its faults; and that the place be purified, that the soule may be glorified in it, and never more be separated from it. Now therefore thou hast the originall of the three Principles, out of which it is thy part, by imitating Nature, to produce the Mercury of Philosophers, and their first matter, and to bring those Principles of things, especially of Metalls to thy purpose: seeing without those Principles it is impossible for thee to perfect any thing by Art, since also Nature her selfe can doe nor produce nothing without them. These three are in all things, and without them there is nothing in the world, or ever shall bee naturally. But because wee said before, that the ancient Philosophers named only two Principles, lest the Searcher of the Art should erre, hee must know, that although they did not describe any other but Sulphur, and Mercury, yet without salt they could never have attained to this work, since that is the key, and beginning of this sacred Science: it is that, which openeth the gates of Justice; it is that which hath the keyes to the infernall prisons, where Sulphur lies bound, as hereafter shal be more fully shewed in the third Treatise of the Principles, of Salt.