 Next comes speculative philosophy, and here the order is physics, mathematics, and metaphysics. This order is established on the basis of the proximity of each to the senses, from closest to most distant (DOS 627). The end of the speculative sciences is truth (DOS 394), that is, to know the way of natural things according to their natures (DOS 405). Then comes ethics (DOS 628), the science that considers the human operations in connection with the mortal human body (DOS 404), followed by the sciences of speech/language, which have an order themselves: grammar, rhetoric, and logic.