It's a fable, about moral values. Success, happiness.
9 seconds sound clip from the The Big Knife (1955) movie soundboard.
You can hear this line at 01:17:44 in the Blu-ray version of the movie.
Quote context
[...]
- Well, there's still time. The Chief's a big train. You want me to make reservations for you?
- What's the book is going to be about?
- A man. An average man. A man very much like you.
- Is it really about a guy like me?
- It's a fable, about moral values. Success, happiness.
- You don't think Marion is going to be happy here, do you?
- No, I don't think she's going to be happy.
- Why not?
- You were an idealist, Charlie, and you sold out.
[...]