- If you just use your head.
- Yes, heads instead of hearts.

— Griff Marat (Cornel Wilde), Jenny Marsh (Patricia Knight)

5 seconds sound clip from the Shockproof (1949) movie soundboard.

You can hear this line at 01:09:44.986 in the Blu-ray version of the movie.

Quote context

[...]

- Just before we got off the bus, I told you Colorado.

- I couldn't remember.

- Well, I have to remember everything. Fake names, fake social security numbers. Remember to leave before they get wise to me. And you don't even remember the name of a state.

- I'm sorry, Griff. I made a mistake.

- Well, we can't afford mistakes. You know how much depends on it. Now that guy probably suspects something's phony.

- It's no good, is it, Griff?

- If you just use your head.

- Yes, heads instead of hearts.

- Forgive me, Jenny. I didn't mean it.

- Why do we quarrel like this? Sometimes I start it, sometimes you. We're not getting on with each other, or with other people.

- What's happening to us?

- Nothing, honey. We're under strain.

- I'm sorry I was irritable. I don't know what's the matter with me. I'm just tired, I guess.

[...]