2 specific quotes from Chapter 21 that capture the chapter's importance.

Jem smiled. ‘He’s not supposed to lean. Reverend, but don’t fret, we’ve won it,’ he said wisely. ‘Don’t see how any jury could convict on what we heard—’

I looked around. They were standing. All around us and in the balcony on the opposite wall, the Negroes were getting to their feet. Reverend Sykes’s voice was as distant as Judge Taylor’s:

‘Miss Jean Louise, stand up. Your father’s passin’.’