What does Juror Ten say they owe the boy who is on trial?

Juror Ten says that as jurors, they owe the boy nothing.

NO. 10: I don't mind telling you this, mister. We don't owe him a thing. He got a fair trial, didn't he? You know what that trial cost? He's lucky he got it. Look, we're all grownups here. You're not going to tell us that we're supposed to believe him, knowing what he is. I've lived among 'em all my life. You can't believe a word they say. You know that.