What are some ways that Tom Sawyer grows up in The Adventures of Tom Sawyer by Mark Twain?

Tom Sawyer demonstrates maturity when he takes a whipping for his torn spelling book. Later, he takes the blame for ripping a page of Mr. Dobbins's anatomy book. Tom committed neither of these acts. Later, Tom courageously testifies against Injun Joe in defense of Muff Potter.

Tom demonstrates moral strength in chapter 20 when he takes the punishment for spilled ink on the spelling book, even though he has not done the damage to this...

Tom Sawyer demonstrates maturity when he takes a whipping for his torn spelling book. Later, he takes the blame for ripping a page of Mr. Dobbins's anatomy book. Tom committed neither of these acts. Later, Tom courageously testifies against Injun Joe in defense of Muff Potter.

Tom demonstrates moral strength in chapter 20 when he takes the punishment for spilled ink on the spelling book, even though he has not done the damage to this school book. When he returns to his seat, Tom starts to think that he may have upset the ink upon the spelling book. Becky Thatcher keeps quiet about Alfred Temple having done the damage because she is angry with Tom. After an hour, Mr. Dobbins unlocks his drawer and pulls out his treasured anatomy book to read it. Tom glances at Becky, knowing that she has previously removed the book from the drawer and has torn a page in her hurry to replace it. When he sees Becky looking like "a helpless rabbit," Tom forgets his quarrel with her, and he considers grabbing the book and running out the door. Unfortunately, it is too late. "Who tore this book?" Mr. Dobbins demands. He calls on each student until Tom shouts, "I done it!" to protect Becky. Tom takes

Without an outcry the most merciless flaying that even Mr. Dobbins had ever administered (Ch.20).

It is worth the whipping to him when Becky says, "Tom, how could you be so noble!" (Ch.20).

In chapter 23, Tom's decision to come to the defense of Muff Potter at his trial marks the attainment of moral courage in Tom; although he is still in fear of Injun Joe, he feels he is obligated to reveal the truth. Tom puts aside his fears and his superstitions about the blood oath that he has sworn with Joe Harper not to tell. Instead, Tom testifies in court that he hid behind trees on the edge of the grave. Tom further reveals that he witnessed Injun Joe brutally stab Dr. Robinson after Muff was knocked unconscious. When this is said, Injun Joe springs for a window and is gone. However, Muff Potter is acquitted.