- I don't believe you.
- You will this time.

6 seconds sound clip from the The Doctor Prescribed Death (Suspense) classic radio play.

You can hear this line at 00:14:10 in the radio play.

Quote context

[...]

- If you know who the intended victim is, why don't you stop it?

- You're insane... hopelessly insane. The whole idea is mad, too utterly ridiculous for words.

- No sane man would ever think of such a useless, senseless idea. And for heaven's sake, stop laughing!

- I'm thinking about the victim... and he learned.

- Who is the victim?

- Martin Hellman.

- Me?

- Yes, you.

- I don't believe you.

- You will this time.

- Who is this girl? I know no girl who'd want to kill me.

- This one does... now.

- Oh, nonsense. However, I wouldn't put it past you to hire someone to do something like this

- No, this girl is no fake. This girl is serious... deadly serious.

- You probably hypnotized some poor woman figuring she'd never remember what happened.

[...]