He's supposed to be very good with a knife but only in matters of business with some sort of reasonable complaint.
8 seconds sound clip from the The Godfather (1972) movie soundboard.
You can hear this line at 00:34:39 in the Blu-ray version of the movie.
Quote context
[...]
- Thank you for the dinner and a very pleasant evening.
- You're not too tired are you, Tom?
- I have the Sollozzo notes here.
- Now Sollozzo is known as The Turk.
- Now, he needs cash and he needs protection from the police for which he gives a piece of the action.
- I couldn't find out how much.
- The Tattaglia family is behind him here in New York.
[...]