This opinion, considered a heresy by the holy Pontiff (and by all the great theologians since him), is called Agnoeticism, meaning “not knowing”.
A sect of Monophysites who held that Christ was subject to positive ignorance. The leading exponent of its error was Deacon Themistios of Alexandria.
To attribute ignorance to Christ’s human nature is to profess Nestorianism
We assert that the Lord says that the “Son does not know” in the sense that he does not make this truth to be known. That is, he does not reveal it.
Christ enjoyed in his human knowledge the fullness of understanding of the eternal plans he had come to reveal. What he admitted to not knowing in this area, he elsewhere declared himself not sent to reveal.
just as we say that a day is “happy”, not in that the day itself is experiencing the emotion of happiness, but only insofar as the day makes us to be happy. So too, might we say that Jesus was “ignorant”, not as though he himself were ignorant, but only insofar as he left us in ignorance regarding the time of the judgment.
in his human intellect, the Savior (who was ignorant of nothing) must be said to have known when he would return to judge the world by fire. However, this knowledge was not gained through sense experience, but only from the divine infusion of light upon his human soul. Hence, it is known in his soul, but not from his senses.
when the Lord tells us that the Son does not know, he only means to indicate that the time of the judgment cannot be known by any through natural powers (not even by the angels). However, it is truly known to him through supernatural revelation (just as, we may suppose, it is also known to the angels by divine relation).
The Lord Jesus must truly be the judge not only in his divinity, but also in his humanity.
It was not only the divinity which saved us, but his humanity is rightly called the united instrument of our salvation.
if the humanity of Jesus is lacking in any knowledge or any grace, then it cannot be a perfect instrument for the divinity.
we must hold that Jesus knew every created truth, even in his humanity – because, he is the true Judge and Savior as man!
If the Lord Jesus did not know each and every one of us, and all that we would ever do (including also knowing the judgment which he would give us and when he would render that judgment), then we would have to conclude that his love for us would have been imperfect. For he could not love us perfectly, if he did not know us perfectly.
we must hold to the perfection of human knowledge in Christ – because his humanity is the perfect instrument of our salvation.
Pope St. Gregory realized this danger, and rightly stated: “How can one who professes that the Wisdom of God himself became incarnate ever maintain that there is anything which the Wisdom of God does not know?”
