Texts Explained; Eleventhly, Mark 13:32 and Luke 2:52 Arianexplanation of the former text is against the Regula Fidei; and against the context. Our Lord said He was ignorant of the Day, by reason of His human nature. If the Holy Spiritknowsthe Day, therefore the Son knows; if the Son knowsthe Father, therefore He knowsthe Day; if He has all that is the Father's, therefore knowledge of the Day; if in the Father, He knowsthe Day in the Father; if He created and upholds all things, He knowswhen they will cease to be. He knowsnot as Man, argued from Matthew 24:42. As He asked about Lazarus's grave, etc., yet knew, so He knows; as St. Paul says, 'whether in the body I knownot,' etc., yet knew, so He knows. He said He knew not for our profit, that we be not curious as in Acts 1:7 , where on the contrary He did not say He knew not . As the Almighty asks of Adam and of Cain, yet knew, so the Son knows[as God]. Again, He advanced in wisdom also as man, else He made Angels perfect before Himself. He advanced, in that the Godhead was manifested in Him more fully as time went on
42 These things being so, come let us now examine into 'But of that day and that hour knows no man, neither the Angels of God, nor the Son;' for being in great ignorance as regards these words, and being stupefied about them, they think they have in them an important argument for their heresy. But I, when the heretics allege it and prepare themselves with it, see in them the giants again fighting against God. For the Lord of heaven and earth, by whom all things were made, has to litigate before them about day and hour; and the Word who knows all things is accused by them of ignorance about a day; and the Son who knows the Father is said to be ignorant of an hour of a day; now what can be spoken more contrary to sense, or what madness can be likened to this? Through the Word all things have been made, times and seasons and night and day and the whole creation; and is the Framer of all said to be ignorant of His work? And the very context of the lection shows that the Son of God knows that hour and that day, though the Arians fall headlong in their ignorance. For after saying, 'nor the Son,' He relates to the disciples what precedes the day, saying, 'This and that shall be, and then the end.' But He who speaks of what precedes the day, knows certainly the day also, which shall be manifested subsequently to the things foretold. But if He had not known the hour, He had not signified the events before it, as not knowing when it should be. And as any one, who, by way of pointing out a house or city to those who were ignorant of it, gave an account of what comes before the house or city, and having described all, said, 'Then immediately comes the city or the house,' would know of course where the house or the city was (for had he not known, he had not described what comes before lest from ignorance he should throw his hearers far out of the way, or in speaking he should unawares go beyond the object), so the Lord saying what precedes that day and that hour, knows exactly, nor is ignorant, when the hour and the day are at hand.
43. Now why it was that, though He knew, He did not tell His disciples plainly at that time, no one may be curious where He has been silent; for 'Who has known the mind of the Lord, or who has been His counsellor?' but why, though He knew, He said, 'no, not the Son knows,' this I think none of the faithful is ignorant, viz. that He made this as those other declarations as man by reason of the flesh. For this as before is not the Word's deficiency, but of that human nature whose property it is to be ignorant. And this again will be well seen by honestly examining into the occasion, when and to whom the Saviour spoke thus. Not then when the heaven was made by Him, nor when He was with the Father Himself, the Word 'disposing all things,' nor before He became man did He say it, but when 'the Word became flesh.' On this account it is reasonable to ascribe to His manhood everything which, after He became man, He speaks humanly. For it is proper to the Word to know what was made, nor be ignorant either of the beginning or of the end of these (for the works are His), and He knows how many things He wrought, and the limit of their consistence. And knowing of each the beginning and the end, He knows surely the general and common end of all. Certainly when He says in the Gospel concerning Himself in His human character, 'Father, the hour has come, glorify Your Son,' it is plain that He knows also the hour of the end of all things, as the Word, though as man He is ignorant of it, for ignorance is proper to man, and especially ignorance of these things. Moreover this is proper to the Saviour's love of man; for since He was made man, He is not ashamed, because of the flesh which is ignorant, to say 'I know not,' that He may show that knowing as God, He is but ignorant according to the flesh. And therefore He said not, 'no, not the Son of God knows,' lest the Godhead should seem ignorant, but simply, 'no, not the Son,' that the ignorance might be the Son's as born from among men.
44. On this account, He alludes to the Angels, but He did not go further and say, 'not the Holy Ghost;' but He was silent, with a double intimation; first that if the Spirit knew, much more must the Word know, considered as the Word, from whom the Spirit receives; and next by His silence about the Spirit, He made it clear, that He said of His human ministry, 'no, not the Son.' And a proof of it is this; that, when He had spoken humanly 'No, not the Son knows,' He yet shows that divinely He knew all things. For that Son whom He declares not to know the day, Him He declares to know the Father; for 'No one,' He says, 'knows the Father save the Son.' And all men but the Arians would join in confessing, that He who knows the Father, much more knows the whole of the creation; and in that whole, its end. And if already the day and the hour be determined by the Father, it is plain that through the Son are they determined, and He knows Himself what through Him has been determined, for there is nothing but has come to be and has been determined through the Son. Therefore He, being the Framer of the universe, knows of what nature, and of what magnitude, and with what limits, the Father has willed it to be made; and in the how much and how far is included its period. And again, if all that is the Father's, is the Son's (and this He Himself has said), and it is the Father's attribute to know the day, it is plain that the Son too knows it, having this proper to Him from the Father. And again, if the Son be in the Father and the Father in the Son, and the Father knows the day and the hour, it is clear that the Son, being in the Father and knowing the things of the Father, knows Himself also the day and the hour. And if the Son is also the Father's Very Image, and the Father knows the day and the hour, it is plain that the Son has this likeness also to the Father of knowing them. And it is not wonderful if He, through whom all things were made, and in whom the universe consists, Himself knows what has been brought to be, and when the end will be of each and of all together; rather is it wonderful that this audacity, suitable as it is to the madness of the Ario-maniacs, should have forced us to have recourse to so long a defence. For ranking the Son of God, the Eternal Word, among things originate, they are not far from venturing to maintain that the Father Himself is second to the creation; for if He who knows the Father knows not the day nor the hour, I fear lest the knowledge of the creation, or rather of the lower portion of it, be greater, as they in their madness would say, than knowledge concerning the Father.
Source: Four Discourses Against the Arians (New Advent)