Of course he suffers from guilt, because of what our father did, because of what happened to Elizabeth.
11 seconds sound clip from the The Pit and the Pendulum (1961) movie soundboard.
You can hear this line at 00:25:36 in the Blu-ray version of the movie.
Quote context
[...]
- I have come to ask you to please believe him. He has told you the truth.
- Has he?
- Yes.
- In not telling you before, he only meant to spare you pain.
- He is a good man, a kind and gentle man, and I know that he adored your sister.
- One day, while Nicholas was playing in the lower corridor...
- He had been forbidden by our father to enter this chamber at any time.
- The curiosity of youth, however, overcame his fear of challenging our father's discipline.
[...]