He said to them, "Why were you looking for me? Didn't you know that I must be in my Father's house?"
In my Father's house ...  This is the first recorded utterance of Jesus; and, in it, he laid claim to a relationship to Almighty God, in a sense that distinguished his relationship from one that is open to other men; and throughout his ministry, this claim of Jesus was often repeated.  Clearly, this statement of Christ so early in his life is the principal thing Luke intended to be taught by this episode.  Like the apostle John, Luke also regarded the spiritual implications of such an event; and, in this quality, he is more like John than the other synoptics.  As Robertson said: