I was never so sure of anything in my life.

3 seconds sound clip from the The Big Heat (1953) movie soundboard.

You can hear this line at 01:17:52.176 in the Blu-ray version of the movie.

Quote context

[...]

- I've been places those creeps wouldn't go unless they rode in a 50-ton tank. I went in on foot with...

- The story of how you won the Medal of Honor or something.

- All right, big wit, but I'm telling you, anybody who comes through that door, and touches that kid is gonna wind up dead.

- Harry Schoenhopper, the angry poet.

- Seriously, Bannion, we can handle things.

- I was never so sure of anything in my life.

- Do you know where the trouble's coming from?

- I'd feel easier if all of you stayed here.

- Daddy!

- There's my girl. Hello, sweetheart. How are you?

- Will you tell me a story, Daddy?

- Why, sure. Which story, darling?

- The Three Little Kittens.

- That lost their mittens.

[...]