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"We were far too old to settle an argument with a fist fight."
This shows that although Scout is young, she is also decently mature for her age and would prefer to settle things in a peaceful manner.

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"...asking me why I couldn't behave as well as Jem when she knew he was older."
This shows that Jem was a pretty well behaved child although he was older than his sister, Scout.

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"I'm little but I'm old."
This shows how he acknowledges that he is little, however also knows that his body size does not define his mental.

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"A baseball hit into the Radley yard was a lost ball and no questions asked."
This shows that Mr. Radley was not one to be messed with.

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"Our father said we were both right."
Atticus said this when his children were in an argument and this shows he is fair minded which also is supported by the fact that he is a lawyer.