While I haven't read this recently, what sticks out for me is multi-pronged:
A. First, to convince his mother she should go and attend this momentous occasion in his young life, thereby, convincing many other women/mothers to go from Nazareth to Jerusalem as well for this occasion. His focus on equality for all people is evident here...male and female and later on Jew and gentile, rich and poor...
B. And then, to not have his mother allowed to view his coming of age ceremony, that she had to leave along with the other women as they were not permitted in the "sacred" part of affairs in the Temple
C. His absolute horror at watching the cruelty of the animals "sacrificed" in the very same Temple, what he considered up to then, his Father's House, including all the bloodshed and bloodied hands of the butchers. Extremely upset at this sight.
D. During his participation with the elders, after his parents left, and questioning out loud if the laws of Moses were misunderstood...? As he knew the infinite love and patience of his Father, some of their "teachings" were not of this Father whom he came to present to us all.
He had started then to think about it all.
Gumisiriza Julius liked this