Basically it's about whether he thoughts are growing or changing in any ways.
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Jem is shedding his childlike perspective on things. He is beginning to look past circumstantial evidence and see who might be behind the gifts in the tree. Jem thinks on Atticus's statement and about who might be leaving the gifts. He stands out on the porch by himself for a long time. When he comes inside, Scout thinks it looks like he has been crying. He is also losing his confidence that people are inherently good people.