63. Whenever God says that He does not know, He professes ignorance indeed, but is not under the defect of ignorance. It is not because of the infirmity of ignorance that He does not know, but because it is not yet the time to speak, or the divine Plan to act. Thus He says to Abraham, The cry of Sodom and Gomorrah is full, and their sin is very grievous. Therefore I will go down now, and see if they have done altogether according to the cry of it: and if not, I will know [1068] . Here we perceive God not knowing that which notwithstanding He knows. He knows that their sins are very grievous, but He comes down again to see whether they have done altogether, and to know if they have not. We observe, then, that He is not ignorant, although He does not know, but that, when the time comes for action, He knows. This knowledge is not, therefore, a change from ignorance, but the coming of the fulness of time. He waits still to know, but we cannot suppose that He does not know: therefore His not knowing what He knows, and His knowing what He does not know, is nothing else than a divine economy in word and deed.
64. We cannot, then, doubt that the knowledge of God depends on the occasion and not on any change on His part: by the occasion being meant the occasion, not of obtaining but of declaring knowledge, as we learn from His words to Abraham, Lay not thine hand upon the lad, neither do thou anything unto him, for now I know that thou fearest thy God, and hast not withheld thy beloved son, for My sake [1069] . God knows now, but that now I know is a profession of previous ignorance: yet it is not true, that until now God did not know the faith of Abraham, for it is written, Abraham believed in God, and it was counted to him for righteousness [1070] , and therefore this now I know marks the time when Abraham received this testimony, not when God began to know. Abraham had proved, by the sacrifice of his son, the love he bore to God, and God knew it at the time He spoke: but as we cannot suppose that He did not know before, we must for this reason suppose that He took knowledge of it then because He spoke.
By way of example, we have chosen for our consideration this passage out of many in the Old Testament, which treat of the knowledge of God, in order to shew that when God does not know, the cause lies, not in His ignorance, but in the occasion.
65. We find our Lord in the Gospels knowing, yet not knowing, many things. Thus He does not know the workers of iniquity, who glory in their mighty works and in His name, for He says to them, Then will swear, I never knew you; depart from Me, all ye that work iniquity [1071] . He declares with an oath even, that He does not know them, but nevertheless He knows them to be workers of iniquity. He does not know them, not because He does not know, but because by the iniquity of their deeds they are unworthy of His knowledge, and He even confirms His denial with the sanctity of an oath. By the virtue of His nature He could not be ignorant, by the mystery of His will He refused to know. Again the Unbegotten God does not know the foolish virgins; He is ignorant of those who were too careless to have their oil ready, when He entered the chamber of His glorious coming. They come and implore, and so far from not knowing them, He cries, Verily, I say unto you, I know you not [1072] . Their coming and their prayer compel Him to recognize them, but His profession of ignorance refers to His will, not to His nature: they are unworthy to be known of Him to Whom nothing is unknown. Hence, in order that we should not impute His ignorance to infirmity, He says immediately to the Apostles, Watch therefore, for ye know not the day nor the hour [1073] . When He bids them watch, for they know not the day or the hour, He points out that He knew not the virgins, because through sleep and neglect they had no oil, and therefore were unworthy to enter into His chamber.
66. The Lord Jesus Christ, then, Who searcheth the heart and the reins [1074] , has no weakness in His nature, that He should not know, for, as we perceive, even the fact of His ignorance proceeds from the omniscience of His nature. Yet if any there be, who impute to Him ignorance, let them tremble, lest He Who knows their thoughts should say to them, Wherefore think ye evil in your hearts [1075] ? The All-knowing, though not ignorant of thoughts and deeds, sometimes enquires as if He were, as for instance when He asks the woman who it was that touched the hem of His garment, or the Apostles, why they quarrelled among themselves, or the mourners, where the sepulchre of Lazarus was: but His ignorance was not ignorance, except in words. It is against reason that He should know from afar the death and burial of Lazarus, but not the place of his sepulchre: that He should read the thoughts of the mind, and not recognise the faith of the woman: that He should not need to ask concerning anything [1076] , yet be ignorant of the dissension of the Apostles. But He, Who knows all things, sometimes by a practice of economy professes ignorance, even though He is not ignorant. Thus, in the case of Abraham, God concealed His knowledge for a time: in that of the foolish virgins and the workers of iniquity, He refused to recognise the unworthy: in the mystery of the Son of Man, His asking, as if ignorant, expressed His humanity. He accommodated Himself to the reality of His birth in the flesh in everything to which the weakness of our nature is subject, not in such wise that He became weak in His divine nature, but that God, born man, assumed the weaknesses of humanity, yet without thereby reducing His unchangeable nature to a weak nature, for the unchangeable nature was that wherein He mysteriously assumed flesh. He, Who was God is man, but, being man, has not ceased to remain God. Conducting Himself then as one born man, and proving Himself such, though remaining God the Word, He often uses the language of man (though God, speaking as God, makes frequent use of human terms), and does not know that which it is not yet time to declare, or which is not deserving of His recognition.
67. We can now understand why He said that He knew not the day. If we believe Him to have been really ignorant, we contradict the Apostle, who says, In Whom are all the treasures of wisdom and knowledge hidden [1077] . There is knowledge which is hidden in Him, and because it has to be hidden, it must sometimes for this purpose be professed as ignorance, for once declared, it will no longer be secret. In order, therefore, that the knowledge may remain hidden, He declares that He does not know. But if He does not know, in order that the knowledge may remain hidden, this ignorance is not due to His nature, which is omniscient, for He is ignorant solely in order that it may be hidden. Nor is it hard to see why the knowledge of the day is hidden. He exhorts us to watch continually with unrelaxing faith, and withholds from us the security of certain knowledge, that our minds may be kept on the stretch by the uncertainty of suspense, and while they hasten towards and continually look for the day of His coming, may always watch in hope; and that, though we know the time must come, its very uncertainty may make us careful and vigilant. Thus the Lord says, Therefore be ye also ready, for ye know not what hour the Son of Man shall come [1078] ; and again, Blessed is that servant whom His lord, when He cometh, shall find so doing [1079] . The ignorance is, therefore, a means not to delude, but to encourage in perseverance. It is no loss to be denied a knowledge which it is an advantage not to have, for the security of knowledge might breed negligence of the faith, which now is concealed, while the uncertainty of expectation keeps us continually prepared, even as the master of the house, with the fear of loss before his eyes, watches and guards against the dreaded coming of the thief, who chooses the time of sleep for his work.
68. Manifestly, therefore, the ignorance of God is not ignorance but a mystery: in the economy of His actions and words and manifestations, He does not know and at the same time He knows, or knows and at the same time does not know. But we must ask, whether it may not be through the Son's infirmity that He knows not what the Father knows. He could perhaps read the thoughts of the human heart, because His stronger nature can unite itself with a weaker in all its movements, and by the force of its power, as it were, pass through and through the feeble nature. But a weaker nature is powerless to penetrate a stronger: light things may be penetrated by heavy, rare by dense, liquid by solid, but the heavy are impenetrable to the light, the dense to the rare, and the solid to the liquid: the strong are not exposed to the weak, but the weak are penetrated by the strong. Therefore, the heretics say, the Son knew not the thoughts of the Father, because, being Himself weak, He could not approach the more powerful and enter into Him, or pass through Him.
69. Should any one presume, not merely to speak thus of the Only-begotten God in the rashness of his tongue, but even to think so in the wickedness of his heart, let him hear what the Apostle thought of the Holy Ghost, from the words he wrote to the Corinthians, But unto us God revealed them through the Spirit: for the Spirit searcheth all things, yea the deep things of God. For who among men knoweth the things of a man, which are in him, save the spirit of the man which is in him? Even so the things which are in God, none knoweth, save the Spirit of God [1080] . But let us cast aside these empty illustrations of material things, and measure God born of God, Spirit of Spirit, by His own powers and not by earthly conditions. Let us measure Him not by our own senses, but by His divine claims. Let us believe Him Who said, He that hath seen Me hath seen the Father also [1081] . Let us not forget that He said, Believe, if only by My works, that the Father is in Me, and I in the Father [1082] , and again, I and the Father are one [1083] . If the names which correspond to realities, when intelligibly used, impart to us any true information, then He Who is seen in Another by the eye of understanding is not different in nature from that Other; not different in kind, since He abides in the Father, and the Father in Him; not separate, since Both are One. Perceive their unity in the indivisibility of their nature, and apprehend the mystery of that indivisible nature by regarding the One as the mirror of the Other. But remember that He is the mirror, not as the image reflected by the splendour of a nature outside Himself, but as being a living nature, indistinguishable from the Father's living nature, derived wholly from the whole of His Father's, having the Father's in Him because He is the Only begotten, and abiding in the Father, because He is God.
70. The heretics cannot deny that the Lord used these words to signify the mystery His birth, but they attempt to escape from them by referring them to a harmony of will. They make the unity of God the Father and God the Son not one of divinity, but merely of will: as if the divine teaching were poor in expression and the Lord could not have said, I and the Father are one in will; or as if those words could have the same meaning as I and the Father are one; or as if He meant, He that hath seen My will, hath seen the will of My Father also, but, being unskilled statement, tried to express that idea in the words, He that hath seen Me hath seen the Father also: or as if the divine vocabulary did not contain the terms, The will of My Father is in Me, and My will is in the Father, but this thought could be expressed by I in the Father and the Father in Me. All this is nauseous and irreverent nonsense; common sense condemns the judgment of such silly fancies, as that the Lord could not say what He wanted, or did not say what He said. True, we find Him speaking in parables and allegories, but it is a different thing to strengthen one's words with illustrations, or satisfy the dignity of the subject with the help of suggestive proverbs, or adapt one's language to the needs of the moment. But this passage concerning the unity, of which we are speaking, does not allow us to look for the meaning outside the plain sound of the words. If Father and Son are one, in the sense that They are one in will, and if separable natures cannot be one in will, because their diversity of kind and nature must draw them into diversities of will and judgment, how can They be one in will, not being one in knowledge? There can be no unity of will between ignorance and knowledge. Omniscience and nescience are opposites, and opposites cannot be of the same will.