On completing, then, the whole of what we propose in the commentaries, on which, if the Spirit will, we ministering to the urgent need, (for it is exceedingly necessary, before coming to the truth, to embrace what ought to be said by way of preface), shall address ourselves to the true gnostic science of nature, receiving initiation into the minor mysteries before the greater; so that nothing may be in the way of the truly divine declaration of sacred things, the subjects requiring preliminary detail and statement being cleared away, and sketched beforehand. The science of nature, then, or rather observation, as contained in the gnostic tradition according to the rule of the truth, depends on the discussion concerning cosmogony, ascending thence to the department of theology. Whence, then, we shall begin our account of what is handed down, with the creation as related by the prophets, introducing also the tenets of the heterodox, and endeavouring as far as we can to confute them. But it shall be written if God will, and as He inspires; and now we must proceed to what we proposed, and complete the discourse on ethics.