Sentence:  He thus explains the scope of the “<WSD>Denarian</WSD> Tract,” which forms the third portion of the work: “The Denary or number Ten, is the highest number according to the largest extent of Nature; or the number Five being the Spirit or Quintessence, joined with its body, the number Four, or the four Elements made pure, out of this number Nine, or by the conjunction of Four and Five, the sum of perfection is brought forth, which is the number Ten. 
Meaning of the word marked with <WSD> tags:  Pertaining to a form a numerology that views the number 10 as the most perfect or powerful number.