Charles Buck Theological Dictionary
(from "to be ignorant of, ") a sect which appeared about 370. They called in question the omniscience of God; alleging that he knew things past only by memory, and things future only by an uncertain prescience. There arose another sect of the same name in the sixth century, who followed Themistius, deacon of Alexandria. They maintained that Christ was ignorant of certain things, and particularly of the time of the day of judgment. It is supposed they built their hypothesis on that passage in Mark 13:1-37
"Of that day and that hour knoweth no man; no, not the angels which are in heaven, neither the Son, but the Father." The meaning of which, most probably, is, that this was not known to the Messiah himself in his human nature, or by virtue of his unction, as any part of the mysteries he was to reveal; for, considering him as God, he could not be ignorant of anything.
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Buck, Charles. Entry for 'Agnoet Ae'. Charles Buck Theological Dictionary. https://www.studylight.org/dictionaries/eng/cbd/a/agnoet-ae.html. 1802.