She's young. Her mind would be incapable of receiving such a shock.

6 seconds sound clip from the The Curse of Frankenstein movie soundboard.

You can hear this line at 00:23:32.692 in the Blu-ray version of the movie.

Quote context

[...]

- What about these? Have you ever seen anything so beautiful? Bardello's hands. The hands of the world's greatest sculptor.

- Where did you get them?

- Leipzig. I heard that Bardello died there last week. All it needed was a little bribery.

- You realize what this means?

- It means that our friend here will be reborn with the finest hands ever possessed by any man.

- I mean your cousin's arrival. We can't continue with this experiment. Not here, anyway.

- What are you talking about?

- Elizabeth. She might find out.

- What if she does? Where's the harm?

- She's young. Her mind would be incapable of receiving such a shock.

- All right! You can't see the horror of what you're doing. At first I was blind to it.

- And now?

- While you were away, I decided I could not continue with this experiment.

- I hope I can convince you I'm right, change your mind, too.

- You'll never do that, Paul.

[...]