In To Kill A Mocking Bird at the end of Chapter 10, How does Jem reveal that he is more mature than scout in their discussion.

Scout wants to tell everyone at school about their dad "One-Shot Finch", but Jem tells her that if Atticus wanted them to know, he would have told them himself, so she shouldn't tell her classmates. It is very mature of Jem to not want to brag.