It's been a long time since you've talked, except to yourself.
5 seconds sound clip from the The Omega Man (1971) movie soundboard.
You can hear this line at 00:39:05 in the Blu-ray version of the movie.
Quote context
[...]
- You are discarded. You are the refuse of the past.
- How hard it is to admit the truth...
- Take him to the little room for the questioning.
- Well, Mr. Neville, now we can talk a little while.
- It's been a long time since you've talked, except to yourself.
- Tell me something, would you? Are you fellas really with the Internal Revenue Service?
- I'm a scientist. What the hell are you?
- Definition of a scientist: A man who understood nothing, until there was nothing left to understand.
- Well... So there is a little light in the forest after all.
[...]