Here is a quote, which is on page 30 in my book but definitely in chapter 3, is one of my favorites.
“First of all,” he said, “if you can learn a simple trick, Scout, you’ll get along a lotbetter with all kinds of folks. You never really understand a person until youconsider things from his point of view-”“Sir?”“-until you climb into his skin and walk around in it.”
Another example is his reaction to Boo Radley placing the blanket around Scout's shoulders during the fire.
“That’s all right, son.” Atticus grinned slowly. “Looks like all of Maycomb wasout tonight, in one way or another. Jem, there’s some wrapping paper in the pantry, I think. Go get it and we’ll—" (ch 8)
He agrees to not return the blanket, potentially getting Boo in trouble.