11. But to the Sethians it appears that there are three definite principles of the universals. And that each of these principles (has boundless powers ... everything which you perceive by your mind or which you pass over for lack of thought)[23] is formed by nature to become [each of the principles] as in the human soul every art is to be learned. As if [they say] there should come to a boy spending some time with a pipe-player, the power of pipe-playing, or with a geometrician the power of measurement, or in like manner with any other art. But the substances of the principles, they say, are light and darkness. And between them is pure spirit. But the spirit which is set between the darkness which is below and the light which is above is, they say, not spirit like a gust of wind or any small breeze which may be perceived, but resembles some faint fragrance of balsam or [Sidenote: p. 484.] of incense artificially compounded as a power penetrating by force of fragrance and better than words can say. But because the light is above and the darkness below and the spirit between them, the light, like a ray of the sun on high, shines on the underlying darkness, and the fragrance of the spirit holding the middle place is borne and spread abroad as the odour of incense on the fire is borne. And as the power of the triply divided is such, the power of the spirit and the light together are below in the darkness beneath. But, they say, the darkness is a fearful water into which the light is drawn down with the spirit and changed into a similar nature. Now the darkness is sensible, and knows that if the light is taken away from it, the darkness will remain desolate, viewless, without light, powerless, idle and weak. In this way by all its wit and foresight it is forced to retain within itself the brilliance and scintillation of the light along with the fragrance of the spirit.