No. I'm just as unsure as you are. I don't know that this is a contagion of the soul that you carry, a contagion bred of evil, nameless, unearthly.

12 seconds sound clip from the Isle of the Dead (1945) movie soundboard.

You can hear this line at 00:41:07.799 in the Blu-ray version of the movie.

Quote context

[...]

- You know what my troops call me?

- They call you The Watchdog.

- Yes.

- We have the plague here. I said I'd stand watch against the plague.

- But St. Aubyn died, the doctor died. I tried everything, every human remedy.

- And now that you've failed, you think it's some of Kyra's nonsense: the evil spirit, the Vorvolaka.

- I don't know. Perhaps.

- That is stupidity. That is superstition. Let me by, please.

- No. I'm just as unsure as you are. I don't know that this is a contagion of the soul that you carry, a contagion bred of evil, nameless, unearthly.

- But until I do know, I must keep you away from the others, and if necessary, I'll make an end in the only way that we know that a Vorvolaka can be killed.

- It's impossible. I'm flesh and blood. I remember my mother and father.

- Yes, but when you awaken in the morning, what do you remember of the night before? Of your visits to the Englishwoman?

- Sometimes at night, I tend her. I help her when she feels ill. I loosen the nightgown at her throat.

- At her throat. That you remember.

[...]