In To Kill A Mockingbird, Atticus teaches his children what courage is. In chapter 10, Scout and Jem are surprised when their peaceful, non violent father is called to shoot the rabid dog in the street. Atticus shows courage by making the shot, as he must kill the dog before it can hurt anybody, and only has one shot to do so. He demonstrates courage further by not bragging about his talent, and choosing to live a peaceful life instead of often using his gun.
"I wanted you to see what real courage is, instead of getting the idea that courage is a man with a gun in his hand. It's when you know you're licked before you begin anyway and you see it through no matter what. You rarely win, but sometimes you do."
Atticus says this quote at the end of chapter 11, after Mrs. Dubose dies. Atticus makes Jem go to Mrs. Dubose's house and read to her every day, and it is not until afterward that Atticus explains Mrs. Dubose was battling a morphine addiction, and the reading helped her end it. Atticus explains what real courage is in order to teach his children.
Atticus demonstrates this moral courage by accepting Tom Robinson's case and truly fighting for him. Atticus is assigned the case, but people become angry when they see that Atticus does all he can to help Tom get off. According to society, Atticus should not put forth his best effort in the defense, but Atticus does what he knows is right even if it is not popular.
Atticus shows courage when his children are attacked at the end of the novel. He believes Jem has killed Mr. Ewell, but does not want Heck Tate to cover it up.
"Heck," Atticus's back was turned. "If this thing's hushed up it'll be a simple denial to Jem of the way I've tried to raise him. Sometimes I think I'm a total failure as a parent, but I'm all they've got. Before Jem looks at anyone else he looks at me, and I've tried to live so I can look squarely back at him."
Atticus shows a moral courage throughout the novel in what he says, does, and teaches to his children.