Because He was a small child, He is found “in the midst of the teachers,” sanctifying and instructing them. Because He was a small child, He is found “in their midst,” not teaching them but “asking questions.” He did this because it suited His age, to teach us what befits boys, even if they are wise and learned. They should rather hear their teachers than want to teach them, and not show off with empty displays. As I was saying, He interrogated the teachers not to learn anything, but to teach them by His questions. From one fountain of doctrine, there flow both wise questions and wise answers. It is part of the same wisdom to know what you should ask and what you should answer. It was right for the Savior first to become a master of learned interrogation; later He would answer questions according to God’s Reason and Word.
He is said to have progressed in wisdom and age and grace, because He did increase in age and by this increase in age brought more into evidence the wisdom inherent in Him; further, because by making what is ours altogether His own He made His own the progress of men in wisdom and grace, as well as the fulfillment of the Father’s will, which is to say, men’s knowledge of God and their salvation. Now, those who say that He progressed in wisdom and grace in the sense of receiving an increase in these are saying that the union was not made from the first instant of the flesh’s existence. Neither are they holding the hypostatic union, but, misled by the empty-headed Nestorius, they are talking preposterously of a relative union and simple indwelling, “understanding neither the things they say, nor whereof they affirm.” For, if from the first instant of its existence the flesh was truly united to God the Word—rather, had existence in Him and identity of person with Him—how did it not enjoy perfectly all wisdom and grace? It did not share the grace and neither did it participate by grace in the things of the Word; rather, because the human and divine things had become proper to the one Christ by the hypostatic union, then, since the same was at once God and man, it gushed forth with the grace and the wisdom and the fullness of all good things for the world.
John of Damascus, Orthodox Faith 3.22