I don't think we'd better say any more, or one of us will be saying too much.
6 seconds sound clip from the Gone with the Wind (1939) movie soundboard.
You can hear this line at 02:33:42 in the Blu-ray version of the movie.
Quote context
[...]
- Why, if she thought anybody'd take after her, she'd walk down the street naked.
- You've done all you could to lower the prestige of decent people.
- And now you've endangered the lives of our men because they've got to...
- India!
- I don't think we'd better say any more, or one of us will be saying too much.
- What's going on around here that I don't know about?
- Shh! Somebody's coming up the walk. Somebody that ain't Mr. Ashley.
- Will you hand me the pistol, please?
- Whoever it is, we know nothing.
[...]