What do the kids learn from Atticus's closing statment

The children learn that Atticus doesn't believe the verdict will go Tom's way.

Atticus’s voice had dropped, and as he turned away from the jury he said something I did not catch. He said it more to himself than to the court. I punched Jem. “What’d he say?”

“‘In the name of God, believe him,’ I think that’s what he said.”