Well, I'm glad I didn't know.
3 seconds sound clip from the Dark Command (1940) movie soundboard.
You can hear this line at 01:03:35 in the Blu-ray version of the movie.
Quote context
[...]
- Well, you're relievin' me of that, and that's fine. Maybe I ought to thank you.
- Well, I'm glad I didn't know.
- That'll be something for Cantrell to do when he gets here ridin'.
- Well, the point's well taken.
[...]