What are a few quotes that show signs of maturity in Jem Finch?

"Overnight, it seemed, Jem had acquired an alien set of values and was trying to impose them on me: several times he went so far as to tell me what to do" (Lee 131).

"In addition to Jem's newly developed characteristics, he had acquired a maddening air of wisdom" (Lee 133).

"Dill's eyes flickered at Jem, and Jem looked at the floor. then he rose and broke the remaining code of our childhood. He went out of the room and down the hall. "Atticus," his voice was distant, "can you come here a minute, sir?" (Lee 159).

"His maddening superiority was unbearable these days" (Lee 156).

"He was difficult to live with, inconsistent, moody" (Lee 131).