If you help me, I promise that once I've proved my theories, I'll dispose of this creature.

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

You can hear this line at 00:48:45.167 in the Blu-ray version of the movie.

Quote context

[...]

- You must be mad.

- That apparatus was constructed for dual operation. You know that. I thought I could work it myself, but I can't.

- I'm delighted. That means your experiment will not succeed.

- You're going to help me, Paul, whatever you say.

(Water bubbling in Frankenstein's lab) (2)

- If you help me, I promise that once I've proved my theories, I'll dispose of this creature.

- How long will that take?

- A month, two at the outside.

- And have that thing alive up there all the time? No!

- If you don't help me, then I make no such promise.

- Somehow, I'll manage on my own. However difficult, I'll do it.

[...]