Friendly Persuasion (1956)
Jess Birdwell: I'm just his father, Eliza, not his conscience. A man's life ain't worth a hill of beans except he lives up to his own conscience.
Prof. Waldo Quigley: I want you to know, sir, I honor your prejudices - -um, uh, convictions.
Josh Birdwell: I don't want to die. I don't think I could kill anyone if I tried. But I have to try, so long as other people have to.