I understand you're confusing gratitude with affection.

— Paul Krempe (Robert Urquhart)

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

You can hear this line at 00:26:31.775 in the Blu-ray version of the movie.

Quote context

[...]

- Then I shall have to ask Victor. If I'm to marry him, then I have a right to know.

- Marry?

- Of course, we're engaged. Didn't he tell you?

- How can you be engaged to someone you don't even know?

- It was an arrangement between Victor and my mother.

- That's absurd. You can't be expected to honor an arrangement of that sort.

- My mother and I were entirely dependent upon Victor. We'd have starved without him. Now, perhaps, you understand.

- I understand you're confusing gratitude with affection.

- You have no right to speak to me like that. How dare you!

- I'm sorry. It's entirely your own affair and nothing to do with me.

- Nevertheless, I still think you should leave here. Believe me, it's for your own good.

- Really, Paul, I can't imagine why you make this idiotic request.

[...]