For the proof of this they bring forward the anatomy of the brain, likening the cerebrum to the Father from its immobility, and the cerebellum to the Son from its being moved and existing in serpent form. Which (last) they imagine ineffably and without giving any sign to attract [Sidenote: p. 208.] through the pineal gland the spiritual and life-giving substance emanating from the Blessed One.[247] Receiving which the cerebellum, as the Son silently transfers the forms to Matter, spreads abroad the seeds and genera of things born after the flesh, to the spinal marrow. By the use of this simile, they seem to introduce cleverly their ineffable mysteries handed down in silence which it is not lawful for us to utter. Nevertheless they will easily be comprehended from what I have said.
18. But since I think I have set forth clearly the Peratic heresy and by many words have made plain what had escaped (notice), and since it has mixed up everything with everything concealing its own peculiar poison, it seems right to proceed no further with the charge, the opinions laid down by them being sufficient accusation against them.[248]
[Sidenote: p. 209.] 19. Let us see then what the Sethians say.[249] They are of opinion[250] that there are three definite principles of the universals, and that each of the principles contains boundless powers. But what they mean by powers let him judge who hears them speak thus: Everything which you understand by your mind or which you pass by unthought of, is formed by nature to become each of these principles, as in the soul of man every art which is taught. For example, he says, that a boy will become a piper if he spend some time with a piper, or a geometrician if he does so with a geometrician, or a grammarian with a grammarian, or a carpenter with a carpenter, and to one in close contact with other trades it will happen in the same way. But the substance of the principles, he says, are light and darkness; and between them there is uncontaminated spirit. But the spirit which is set between the darkness below and the light on high, is not breath like a gust of wind or some little [Sidenote: p. 210.] breeze which can be perceived, but resembles some faint perfume of balsam or of incense artificially compounded, as a power penetrating by force of a fragrance inconceivable and better than can be said in speech. But since the light is above and the darkness below and the spirit as has been said between them, the light naturally shines like a ray of the sun on high on the underlying darkness, and again the fragrance of the spirit having the middle place spreads abroad and is borne in all directions, as we observe the fragrance of the incense burnt in the fire carried everywhere. And such being the power of the triply divided, the power of the spirit and of the light together is in the darkness which is ranged below them. But the darkness is a fearful water, into which the light with the spirit is drawn down and transformed into such a nature (as the water).[251] And the darkness is not witless, but prudent completely, and knows that if the light be taken from the darkness, the darkness remains desolate, viewless, without light, [Sidenote: p. 211.] powerless, idle, and strengthless. Wherefore with all its sense and wit it is forced to detain within itself the brilliance and spark of the light with the fragrance of the spirit. And an image of their nature is to be seen in the face of man, (to wit) the pupil of the eye dark from the underlying fluids, (and) lighted up by (the) spirit. As then the darkness seeks after the brilliance, that it may hold the spark as a slave and may see, so do the light and the spirit seek after their own power, and make haste to raise up and take back to themselves their powers which have been mingled with the underlying dark and fearful water.[252] But all the powers of the three principles being everywhere boundless in number are each of them wise and understanding as regards its own substance, and the countless multitude of them being wise and understanding, whenever they remain by themselves are all at rest. But if one power draws near to another, the unlikeness of (the things in) juxtaposition effects a certain movement and activity formed from the movement, by the coming together and juxtaposition of the meeting [Sidenote: p. 212.] powers. For the coming together of the powers comes to pass like some impression of a seal struck by close conjunction for the sealing of the substances brought up (to it).[253] Since then the powers of the three principles are boundless in number and the conjunctions of the boundless powers (also) boundless, there must needs be produced images of boundless seals.