Luke 2:48 Meaning

46And it came to pass, that after three days they found him in the temple, sitting in the midst of the doctors, both hearing them, and asking them questions.

47And all that heard him were astonished at his understanding and answers.

48And when they saw him, they were amazed: and his mother said unto him, Son, why hast thou thus dealt with us? behold, thy father and I have sought thee sorrowing.

49And he said unto them, How is it that ye sought me? wist ye not that I must be about my Father's business?

50And they understood not the saying which he spake unto them.