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 hath known the mind of the Lord, or who hath 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. - St Athanasius the Great