From Stomata Book 5

Now the sacrifice which is acceptable to God is unswerving abstraction from the body and its passions. This is the really true piety. And is not, on this account, philosophy rightly called by Socrates the practice of Death? For he who neither employs his eyes in the exercise of thought, nor draws aught from his other senses, but with pure mind itself applies to objects, practises the true philosophy. This is, then, the import of the silence of five years prescribed by Pythagoras, which he enjoined on his disciples; that, abstracting themselves from the objects of sense, they might with the mind alone contemplate the Deity. It was from Moses that the chief of the Greeks drew these philosophical tenets. For he commands holocausts to be skinned and divided into parts. For the gnostic soul must be consecrated to the light, stript of the integuments of matter, devoid of the frivolousness of the body and of all the passions, which are acquired through vain and lying opinions, and divested of the lusts of the flesh. But the most of men, clothed with what is perishable, like cockles, and rolled all round in a ball in their excesses, like hedgehogs, entertain the same ideas of the blessed and incorruptible God as of themselves. But it has escaped their notice, though they be near us, that God has bestowed on us ten thousand things in which He does not share: birth, being Himself unborn; food, He wanting nothing; and growth, He being always equal; and long life and immortality, He being immortal and incapable of growing old. Wherefore let no one imagine that hands, and feet, and mouth, and eyes, and going in and coming out, and resentments and threats, are said by the Hebrews to be attributes of God. By no means; but that certain of these appellations are used more sacredly in an allegorical sense, which, as the discourse proceeds, we shall explain at the proper time.