Theophylact of Ohrid — as excerpted in the Catena Aurea on Luke 2:39-41

“For if while yet a little child, He had displayed His wisdom, He would have seemed a miracle, but together with the advance of age He gradually shewed Himself, so as to fill the whole world. For not as receiving wisdom is He said to be strengthened in spirit. For that which is most perfect in the beginning, how can that become any more perfect. Hence it follows, Filled with wisdom, and the grace of God was in him.”