I told you I was at the last stage but one: The brain. A brain of superior intellect. A lifetime of knowledge already behind it.

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

You can hear this line at 00:33:17.763 in the Blu-ray version of the movie.

Quote context

[...]

- Look, I admit he isn't a particularly good-looking specimen at present, but don't forget, one's facial character is built up by what lies behind it... in the brain.

- A benevolent mind, and the face assumes the patterns of benevolence.

- An evil mind, then an evil face.

- For this the brain of a genius will be used.

- When that brain starts to function within the frame, then the face and features will assume wisdom and understanding.

- I told you I was at the last stage but one: The brain. A brain of superior intellect. A lifetime of knowledge already behind it.

- Imagine that. My creature will be born with a lifetime of knowledge.

- Where is this brain to come from?

- I'll get it.

- Ihr or dir. Your hospitality is too generous, my dear Baron.

[...]