Here’s the Augustine link. If you care to check it out in a Father’s set or whatever, it is from Augustine’s “On the Trinity” Chapter 12 at
ccel.org/fathers2/NPNF1-03/npnf1-03-07.htm#P168_49840
Here is the most relevant paragraph:
Again, "Of that day and that hour knoweth no man, no, not the angels which are in heaven; neither the Son, but the Father."
129 For He is ignorant of this, as
making others ignorant; that is, in that He did not so know as at that time to show His disciples:
130 as it was said to Abraham, "Now I know that thou fearest God,"
131 that is, now I have caused thee to know it; because he himself, being tried in that temptation, became known to himself. For He was certainly going to tell this same thing to His disciples at the fitting time; speaking of which yet future as if past, He says, "Henceforth I call you not servants, but friends; for the servant knoweth not what his Lord doeth: but I have called you friends; for all things that I have heard of my Father I have made known unto you;"
132 which He had not yet done, but spoke as though He had already done it, because He certainly would do it. For He says to the disciples themselves, "I have yet many things to say unto you; but ye cannot bear them now."
133 Among which is to be understood also, “Of the day and hour.” For the apostle also says, "I determined not to know anything among you, save Jesus Christ, and Him crucified;"
134 because he was speaking to those who were not able to receive higher things concerning the Godhead of Christ. To whom also a little while after he says, "I could not speak unto you as unto spiritual, but as unto carnal."
135 He was “ignorant,” therefore, among them of that which they were not able to know from him. And that only he said that he knew, which it was fitting that they shouldknow from him. In short, he knew among the perfect what he knew not among babes; for he there says: "We speak wisdom among them that are perfect."
136 For a man is said not to know what he hides, after that kind of speech, after which a ditch is called blind which is hidden. For the Scriptures do not use any other kind of speech than may be found in use among men, because they speak to men.
In the next paragraph, he goes on to relate different Scripture passages that tell of Christ’s being both the form of God, and the form of a servant. It’s really good too.
.
