Luke 2:50 - Ellicott's Commentary On The Whole Bible

They understood not the saying. — We are apt to think that they should have understood, and sceptical criticism has seen in this a contradiction to the previous history of the Annunciation and the Birth. Twelve years, however, of the life of childhood after the outward pattern of that of other children, may have dulled the impressions that had then been made; and even if they, in part, understood the words as referring to the marvel of His birth, they were still in the dark as to what He meant by being “about His Father’s business.” As it was, though it was the first flash of a greatness more than human, it was but momentary. It faded into “the light of common day,” and life went on in its quiet and simple fashion as before. It is clear, at any rate, that the writer of the Gospel was not conscious of any inconsistency between the later and the earlier narratives of the childhood of the Christ.