He has lived so long locked up that he'd be frightened, rave, tear himself to pieces, die, if his door was left open.
8 seconds sound clip from the A Tale of Two Cities (1938) classic radio drama series episode.
You can hear this line at 00:13:36.893 in the radio play.
Quote context
[...]
- My name is Jarvis Lorry of London. This is Miss Manette.
- Yes.
- Changed?
- Yes.
- You think it necessary to keep him locked up?
- I think it necessary to turn the key.
- Why?
[...]