It took us years of unrelenting work to discover what we were seeking.

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

You can hear this line at 00:09:30.065 in the Blu-ray version of the movie.

Quote context

[...]

- You will take up the position. You will be paid as arranged.

- By whom?

- By the Baron. I'm quite rich.

- Now, do you still want the position?

- I should be honored, Herr Baron.

- My first opinion of Paul was soon confirmed. He turned out to be an admirable tutor.

- In two years I'd learned all he had to teach, but we went on together probing into the unknown, investigating, recording, searching.

- Always searching, until gradually the great sweep of our research began to assume a single direction, and to this aim we finally turned all our energies.

- It took us years of unrelenting work to discover what we were seeking.

- Then, one night out of sight and sound of the rest of the house, our efforts were rewarded.

(Electricity crackling in Frankenstein's lab)

(Water bubbling in Frankenstein's lab)

- Paul, it's alive. Paul, we've done it!

[...]