Shoot all the bluebirds you want, if you can hit 'em, but remember it's a sin to kill a mockingbird.
Your father's right. It's a sin to kill a Mockingbird.
Miss Maudie's rear end.
What are you shooting at?
We're really going to have something to talk about at school on Monday!
Don't say anything about it, Scout. I reckon if he'd have wanted us to know, he'da told us.
The quote that Atticus is saying is probably the most famous line in the book, as it sums up one of the most important themes and is very memorable. The reason this is such as poignant quote is because it says that to kill a mockingbird is to destroy innocence as they do nothing but sing their hearts out for the people of Maycomb. Later, Scout explains to Atticus that hurting their reclusive neighbour Boo Radley would be 'sort of like shootin' a mockingbird'. In addition to this, Scout is very innocent at the start of the book but this is taken away from her by the society she lives in and the ordeals she goes through.
At the start of the scene, Scout is found aiming her air rifle at Miss Maudie and Atticus tells Scout that he never wants to see her doing it again. I personally believe that it is a very bad idea to give a young child an air rifle as they don't know what they are doing and may injure or even kill someone. On the other hand, the gun was very useful at the end of the scene as he shot the mad dog, Tim Johnson.
In this scene, we really start to see Jem's maturity. He is now growing much faster than Scout. Whereas Scout just want to brag about her father having the deadest shot in Maycomb, Jem understands that honor and courage are about humility and service, not pride. In addition to this, we learn that Atticus probably didn't want many people to know about his because he thought that God had given him an unfair advantage over most living things.