The power of the crucifix in these cases is two-fold. It protects the normal human being, but reveals the vampire or victim of this vile contagion when in advanced stages.

Abraham Van Helsing (Peter Cushing)

18 seconds sound clip from the Horror of Dracula (1958) movie soundboard.

You can hear this line at 00:36:19.055 in the DVD version of the movie.

Quote context

[...]

- Come in.

- You rang, sir?

- Oh, yes.

- I want this letter delivered first thing in the morning.

- Will you see to that?

- Yes.

- Thank you.

- Thank you, sir.

- Anything the matter? What is it?

- Well, sir, to tell you the truth, when I was outside, I thought I heard you talking to someone.

- Of course you did. I was talking to myself.

- You won't forget that letter, will you?

- No, sir. Yes, sir.

- The power of the crucifix in these cases is two-fold. It protects the normal human being, but reveals the vampire or victim of this vile contagion when in advanced stages.

- Established that victims consciously detest being dominated by vampirism, but are unable to relinquish the practice, similar to addiction to drugs.

- Ultimately, death results from loss of blood. But, unlike normal death, no peace manifests itself for they enter into the fearful state of the undead.

- Since the death of Jonathan Harker, Count Dracula, the propagator of this unspeakable evil, has disappeared. He must be found and destroyed.

- She seems so much weaker, Doctor.

[...]