All of these following quotes occurred on the last page of Chapter 30. Heck Tate has the first two quotes. In the first one he is explaining to Atticus why he doesn't want to tell the whole town that Boo killed Bob. He didn't really commit a crime--he stopped one from happening. In doing so, he saved the kids and is a hero.
"I never heard tell that it's against the law for a citizen to do his utmost to prevent a crime from being committed, which is exactly what he did..."
In the second quote he explains why he can't put Boo in the spotlight of being a hero. It would be too much for him to take (since he is a recluse). He can barely handle meeting Scout for the first time. The "great service" he did was saving the children along with ridding the town of "trash" like Bob Ewell.
"To my way of thinkin', Mr. Finch, taking the one man who's done you and this town a great service an' draggin' him with his shy ways into the limelight--to me, that's a sin."
The final heroic quote is from Atticus as he says good night to Boo on his porch. He thanks him for saving their lives.
Before he went inside the house, he stopped in front of Boo Radley. "Thank you for my children, Arthur."