interpretation of the relation of God to nature and to natural things was already inherent in the Neoplatonic doctrine which formed Bruno's starting-point, since God as the source of emanation was outside of the emanations themselves, and was unaffected by them; on the other hand, the gradations in the different stages of emanation, and the possibility of rising from the lowest to the highest, to the One above all, implied the existence of _somewhat_ of the One as a common nature in all. The two points of view were, however, held apart, and the contradiction between them was not consciously perceived, so that the coincidence of nature between God as the source, and matter as the lowest emanation, never suggested itself; on the contrary, their complete opposition was maintained until Bruno put forward his theory of the "divinity of matter," which forms the real theme of the _Causa_. [Sidenote: Efficient cause of nature.] The _efficient cause_ of the natural world is the universal intelligence, "the first and principal faculty of the soul of the world." This _intellectus universalis_ is to natural things as our intellect to the thoughts of our mind, and Bruno identifies it with the Demiurge of the Platonists, and the "seed-sower" of the Magi, for it impregnates matter with all "forms": it is an _artefice interno_, for it works from within in giving form and figure to matter, as the seed or root from within sends forth the stem, the stem the branches, the branches the formed twigs, and these the buds; "from within leaves, flowers, fruit are formed, figured, patterned; from within again in due time the sap is recalled from leaves and fruit to twigs, from twigs to branches, from these to stem, from stem to root.... But how much greater an artificer is he that works not in any single part of matter alone, but continually and in all."[254] The _intellectus_ is both external and internal to any particular being; _i.e._ it is not a part of any particular existence, is not exhausted by it, therefore is so far external to it; on the other hand, it does not act upon matter from without, but from within,[255] the efficient cause is at the same time an inward principle. [Sidenote: Formal cause of nature.] [Sidenote: Final cause.]