It's best.

Some authorities think different, but mostly it's considered best to kill them--except some that you bring to the cave here, and keep them till they're ransomed." "Ransomed?
What's that ?" "I don't know.

But that's what they do.

I've seen it in books; and so of course that's what we've got to do." "But how can we do it if we don't know what it is ?" "Why, blame it all, we've GOT to do it.

Don't I tell you it's in the books?
Do you want to go to doing different from what's in the books, and get things all muddled up ?" "Oh, that's all very fine to SAY, Tom Sawyer, but how in the nation are these fellows going to be ransomed if we don't know how to do it to them?
-- that's the thing I want to get at.