Lk. 2:46. After three days they found Him in the temple, sitting in the midst of the teachers, listening to them and asking them questions;
Lk. 2:47. All who heard Him were amazed at His understanding and His answers.
He was reasoning with the scribes, posing questions to them from the Law. And all "were amazed." Do you see how He was advancing in wisdom, so that for many He became an object of curiosity and wonder? For the manifestation of His wisdom is His very advancement.
Lk. 2:48. And when they saw Him, they were amazed; and His Mother said to Him: Child! Why have You done this to us? Behold, Your father and I have been searching for You with great sorrow.
The Mother of God calls Joseph father, even though she knew that he was not the father. Without doubt, she names Joseph His father for the sake of the Jews, so that they would not conceive any impure thought concerning His birth. Otherwise: since Joseph applied fatherly care and service in His upbringing, she fittingly called him father himself, as though the Holy Spirit honored him with the title of father.
Lk. 2:49. He said to them: Why did you need to seek Me? Did you not know that I must be about My Father's business?
Why then were they seeking Him? Did they suppose that He, as a child, had gotten lost or gone astray? Away with such a thought! For it could not have occurred either to the most wise Mary, who had received countless revelations about Him, or to Joseph, to whom it had also been revealed that He was of the Holy Spirit. Rather, they were seeking Him lest He had somehow fallen behind them, lest He had somehow left them. And when they found Him, see how He answers them! Since the Virgin had called Joseph His father, He says: he, Joseph, is not My true Father, although I was in his house; but God is My Father, and therefore I am in His house, that is, in His temple.
Lk. 2:50. But they did not understand the words He spoke to them.
"But they did not understand" what He said to them, for this was a mystery.
Lk. 2:51. And He went with them and came to Nazareth; and was in submission to them.
Jesus was obedient to His parents, giving us also an example, so that we too would be obedient to our parents.
Lk. 2:51. And His Mother kept all these words in Her heart.
The Virgin kept all these things; for the deeds and words of the Child were divine and revealed in Him not a twelve-year-old child, but a fully mature man.
Lk. 2:52. And Jesus increased in wisdom and stature
To explain what it means "to increase in wisdom," the Evangelist adds: "and stature," for the increase "in stature" he calls an increase "in wisdom."
and in love with God and men.
that is, he did what was pleasing to God and praiseworthy before men; but first he was acceptable before God, and then before men; for one must first please God, and then men.