Well, if you insist he's there, then I must act on the assumption that he's there.
5 seconds sound clip from the Harvey (1950) movie soundboard.
You can hear this line at 00:17:04.440 in the Blu-ray version of the movie.
Quote context
[...]
- I'm going to do something I should've done long ago.
- I don't understand it, Veta.
- Mr. Minninger is as trustworthy as the Bible.
- I don't know anything about your Mr. Minninger.
- But I do know Elwood Dowd when I see him and he's here. He's here, I tell you.
- Well, if you insist he's there, then I must act on the assumption that he's there.
- I didn't fail, Judge. I haven't even tried yet. I've been in the doctor's office.
- Oh! Excuse me. Hold on, Judge.
- Oh! Oh, Mrs. Halsey, Mrs. Krausmeyer.
- You're not leaving, are you?
[...]