Full context:   "They [the disciples of Marcus] maintain, then, that first of all the four elements, Fire, Water, Earth and Air, were produced after the image of the primary Tetrad above, and that then, when we add their operations, viz., heat, cold, dryness, and humidity, an exact likeness of the Ogdoad is presented. They next reckon up ten powers in the following manner: There are seven globular bodies, which they also call heavens; then that globular body which contains these, which also they name the eighth heaven; and, in addition to these, the Sun and Moon. These, being ten in number, they declare to be types of the invisible Decad, which proceeded from Logos and Zoe. As to the Duodecad, it is indicated by the zodiacal circle, as it is called; for they affirm that the twelve signs do most manifestly shadow forth the Duodecad, the daughter of Anthropos and Ecclesia." (in: Irene de Lyon (ca. 135-205), Contre les hérésies, I 17.1; the text is available through the Gnostic Society, URL: www.webcom.com/~gnosis/library/advh1.htm). Cf. also St. Irene, Contre les hérésies, translation by Adelin Rousseau (et al.), Paris, Cerf, 1965. « Text