How do you know for sure, when he put it to you, that you would be giving all this up?
5 seconds sound clip from the The Greatest (1977) movie soundboard.
You can hear this line at 00:39:26.830 in the Blu-ray version of the movie.
Quote context
[...]
- I will announce it right now...
- Announce what? ...unless you tell me what you're gonna do.
- I'm telling you I'm not gonna do. I'm not gonna denounce my religion.
- You already said that. Don't run off at the mouth, Cassius. Don't run off at the mouth!
- Oh, man. Well, call the fight off!
- At least you get to meet my people two days ahead of time. They weren't coming until Friday.
- Oh, good. I want to meet your mother.
- Yeah, she'd like to meet you, too.
- How do you know for sure, when he put it to you, that you would be giving all this up?
- Yeah?
- Mr. McDonnell wants to talk to you.
- Hey, Mr. McDonnell, I'm surprised to see you.
[...]