In To Kill a Mockingbird, how does Atticus's dealings with different characters bring out different aspects of his own character?

In his treatment of others, Atticus reveals his own
personal integrity. His actions confirm the values he professes, and how he interacts
with the other characters in the novel reveals his decency, strength, and
wisdom.

Atticus values truth and justice; he reveres the
law. In taking Tom Robinson’s case and fighting so hard to free Tom from a gross
injustice, Atticus lives his principles. After losing in court, Atticus plans to appeal
Tom’s conviction; he will not abandon an innocent man. His gentle treatment of Tom and
Tom’s family shows the compassion, empathy, and decency in Atticus’s character. These
same personal traits are shown in his treatment of Mrs. Dubose. Despite her difficult
behavior, Atticus understands her situation and her feelings and treats her with respect
and consideration.

How Atticus interacts with his children
demonstrates his great love for them and his wisdom in guiding them through difficult
times. He listens to them, answers their questions as honestly as he can, and instills
in them, through word and deed, core values of honesty, courage, fairness, respect, and
compassion.

Finally, the manner in which Atticus deals with
Bob Ewell also shows Atticus’s character. He abhors Ewell’s behavior, but he does not
attack him personally or denigrate him while questioning him during Tom’s trial.  He
examines Ewell as a witness, asking the hard questions, but even Ewell is treated with
respect while on the stand. Later, when Ewell confronts Atticus and spits in his face,
Atticus does not react to the insult. His self-respect and dignity demand that he ignore
Ewell’s ignorant and spiteful display.