The holy Apostle Paul says, preserving the prophetic and truly ancient secret from which the teachings that were good were derived by the Greeks: “Howbeit we speak wisdom among them who are perfect; but not the wisdom of this world, or of the princes of this world, that come to nought; but we speak the wisdom of God hidden in a mystery.” Then proceeding, he thus inculcates the caution against the divulging of his words to the multitude in the following terms: “And I, brethren, could not speak to you as to spiritual, but as to carnal, even to babes in Christ. I have fed you with milk, not with meat: for ye were not yet able; neither are ye now able. For ye are yet carnal.”
If, then, “the milk” is said by the apostle to belong to the babes, and “meat” to be the food of the full-grown, milk will be understood to be catechetical instruction—the first food, as it were, of the soul. And meat is the mystic contemplation; for this is the flesh and the blood of the Word, that is, the comprehension of the divine power and essence. “Taste and see that the Lord is Christ,” it is said. For so He imparts of Himself to those who partake of such food in a more spiritual manner; when now the soul nourishes itself, according to the truth-loving Plato. For the knowledge of the divine essence is the meat and drink of the divine Word. Wherefore also Plato says, in the second book of the Republic, “It is those that sacrifice not a sow, but some great and difficult sacrifice,” who ought to inquire respecting God. And the apostle writes, “Christ our passover was sacrificed for us;”—a sacrifice hard to procure, in truth, the Son of God consecrated for us.
— The Stromata, Bk. V. Ch.X