Each year his parents went to Jerusalem for the feast of Passover, and when he was twelve years old, they went up according to festival custom. After they had completed its days, as they were returning, the boy Jesus remained behind in Jerusalem, but his parents did not know it. Thinking that he was in the caravan, they journeyed for a day and looked for him among their relatives and acquaintances, but not finding him, they returned to Jerusalem to look for him. After three days they found him in the temple, sitting in the midst of the teachers, listening to them and asking them questions, and all who heard him were astounded at his understanding and his answers. When his parents saw him, they were astonished, and his mother said to him, "Son, why have you done this to us? Your father and I have been looking for you with great anxiety." And he said to them, "Why were you looking for me? Did you not know that I must be in my Father's house?" But they did not understand what he said to them He went down with them and came to Nazareth, and was obedient to them; and his mother kept all these things in her heart. (Lk 2:41-51)
Jesus at the age of twelve was sure of the purpose of his life. His purpose was to do the will of the father. That is the reason for which he has come and hence that is his mission. This is not only that of Jesus but it should be for every creature in the world. The whole creation has only one purpose and that is to reveal God and make his will and his kingdom established among the creation.
This incident also shows the mind of a mother. Mary wants the child to be with the family. Mary sees this in her own context. (As she asked the anger Gabriel how this could be). In a sense Mary is in her learning process. Jesus’ return to the family and living with them is also a way of helping in this learning process. Obedient to the local situation is also helpful for the wider mission.
Mary kept all these in her heart. Heart of the mother is to keep the events and experiences for reflection. Mother does not throw away the experience as if it had no relevance and importance. Everything has a purpose and meaning in life. Keeping these things in her heart Mary realized the greater importance of these events and hence she was able to cooperate with the plan of God.