1 Corinthians 2:9

"But as it is written, Things which eye saw not and ear heard not, and which entered not into the heart of man, whatsoever things God prepared for them that love Him." Where are these words written? Why, it is said to have been "written," then also, when it is set down, not in words, but in actual events, as in the historical books; or when the same meaning is expressed, but not in the very same words, as in this place: for the words, "They to whom it was not told about Him shall see, and they who have not heard shall understand," are the same with "the things which eye hath not seen, nor ear heard." Either then this is his meaning, or probably it was actually written in some books, and the copies have perished. For indeed many books were destroyed, and few were preserved entire even in the first captivity. And this is plain, in those which remain to us. For the Apostle saith "From Samuel and the Prophets which follow after they have all spoken concerning Him:" and these their words are not entirely extant. Paul, however, as being learned in the law and speaking by the Spirit, would of course know all with accuracy. And why speak I of the captivity? Even before the captivity many books had disappeared; the Jews having rushed headlong to the last degree of impiety: and this is plain from the end of the fourth book of Kings, for the book of Deuteronomy could hardly be found, having been buried somewhere in a dunghill. And besides, there are in many places double prophecies, easy to be apprehended by the wiser sort; from which we may find out many of the things which are obscure. What then, hath "eye not seen what God prepared?" No. For who among men saw the things which were about to be dispensed? Neither then hath "the ear heard, nor hath it entered into the heart of man." How is this? For if the Prophets spoke of it, how saith he, "Ear hath not heard, neither hath it entered into the heart of man?" It did not enter; for not of himself alone is he speaking, but of the whole human race. What then? The Prophets, did not they hear? Yes, they heard; but the prophetic ear was not the ear "of man:" for not as men heard they, but as Prophets. Wherefore he said, "He hath added unto me an ear to hear," meaning by "addition" that which was from the Spirit. From whence it was plain that before hearing it had not entered into the heart of man. For after the gift of the Spirit the heart of the Prophets was not the heart of man, but a spiritual heart; as also he saith himself, "We have the mind of Christ" as if he would say, "Before we had the blessing of the Spirit and learnt the things which no man can speak, no one of us nor yet of the Prophets conceived them in his mind. How should we? since not even angels know them. For what need is there to speak," saith he, "concerning 'the rulers of this world,' seeing that no man knew them, nor yet the powers above?"