Rightly, therefore, the divine apostle says, “By revelation the mystery was made known to me (as I wrote before in brief, in accordance with which, when ye read, ye may understand my knowledge in the mystery of Christ), which in other ages was not made known to the sons of men, as it is now revealed to His holy apostles and prophets.”[788] For there is an instruction of the perfect, of which, writing to the Colossians, he says, “We cease not to pray for you, and beseech that ye may be filled with the knowledge of His will in all wisdom and spiritual understanding; that ye may walk worthy of the Lord to all pleasing; being fruitful in every good work, and increasing in the knowledge of God; strengthened with all might according to the glory of His power.”[789] And again he says, “According to the disposition of the grace of God which is given me, that ye may fulfil the word of God; the mystery which has been hid from ages and generations, which now is manifested to His saints: to whom God wished to make known what is the riches of the glory of this mystery among the nations.”[790] So that, on the one hand, then, are the mysteries which were hid till the time of the apostles, and were delivered by them as they received from the Lord, and, concealed in the Old Testament, were manifested to the saints. And, on the other hand, there is “the riches of the glory of the mystery in the Gentiles,” which is faith and hope in Christ; which in another place he has called the “foundation.”[791] And again, as if in eagerness to divulge this knowledge, he thus writes: “Warning every man in all wisdom, that we may present every man (the whole man) perfect in Christ;” not every man simply, since no one would be unbelieving. Nor does he call every man who believes in Christ perfect; but he says all the man, as if he said the whole man, as if purified in body and soul. For that the knowledge does not appertain to all, he expressly adds: “Being knit together in love, and unto all the riches of the full assurance of knowledge, to the acknowledgment of the mystery of God in Christ, in whom are hid all the treasures of wisdom and of knowledge.”[792] “Continue in prayer, watching therein with thanksgiving.”[793] And thanksgiving has place not for the soul and spiritual blessings alone, but also for the body, and for the good things of the body. And he still more clearly reveals that knowledge belongs not to all, by adding: “Praying at the same time for you, that God would open to us a door to speak the mystery of Christ, for which I am bound; that I may make it known as I ought to speak.”[794] For there were certainly, among the Hebrews, some things delivered unwritten. “For when ye ought to be teachers for the time,” it is said, as if they had grown old in the Old Testament, “ye have again need that one teach you which be the first principles of the oracles of God; and are become such as have need of milk, and not of solid food. For every one