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118 pages, Hardcover
First published January 1, 1831
For science, truly so called, is, as Aristotle accurately defines it to be, the knowledge of things eternal, and which have a necessary existence. Hence it has for its basis universals, and not particulars; since the former are definite, immutable, and real; but the latter are indefinite, are so incessantly changing, that they are not for a moment the same, and are so destitute of reality, that, in the language of the great Plotinus, they may be said to be "shadows falling upon shadow, like images in water, or in a mirror, or a dream."
In that part of the world, however, in which nature and generation predominate, it is necessary that the three following things should be present. In the first place, the body which yields to the touch, and which is the subject of all generated natures. [...] Hence matter (or a universal recipient) is necessary to the existence of generation.
The second thing which is necessary, is the existence of contrarieties, in order that mutations and changes in quality may be effected, matter for this purpose receiving passive qualities, and an aptitude to the participation of forms. [...] these powers are the hot and the cold, the dry and the moist.
Essences rank in the third place; and these are fire and water, air and earth, of which the hot and the cold, the dry and the moist, are powers.