The aspect that was more developed in chapter 15 for Saul, was the social aspect or psychological and moral aspect and why ?

I think hockey meant all of these aspects for Saul. The introduction of hockey changed Saul from the beginning. The new priest, Father Gaston Leboutilier, arrives at St. Germ’s. He’s different, quicker to laugh and kinder to the children, and the other priests and nuns dislike him. One day, he asks Saul if he has heard of hockey. He hasn’t, but Father Gaston’s enthusiasm is infectious, and Saul begins to read about the game. Then he goes to watch the older boys play, and immediately understands the fundamental rhythms of the game. When the priest takes him to watch a game on the television, he is amazed by the new technology, but more amazed by the sport itself. He begs to be allowed to play, but Father Gaston tells him he is too young. Saul asks to care for the rink, and the priest obliges.

Wow! Thank you for the answer