How we cite our quotes: All quotations are from From Here to Eternity.
Quote #1
PREWITT: Look, I told Holmes and I'm telling you... I ain't fighting. I quit fighting! You guys want to put the screws on, go right ahead. I can take anything you can dish out.
Prewitt actually expresses his courage by not fighting instead of fighting. Sometimes it's more courageous to resist.
Quote #2
MAGGIO: I just hate to see a good guy get it in the gut.
BUCKLEY: You better get used to it, kid.
The "good guy" in question is Prewitt. Buckley's cynical (though not necessarily inaccurate) opinion suggests that courage and virtue aren't typically honored in the world.
Quote #3
PREWITT: A man don't go his own way, he's nothing.
WARDEN: Maybe back in the days of the pioneers a man could go his own way, but today you got to play ball.
Warden's actually a capable soldier and fighter, but at this stage of the movie he's become a lackey to the unscrupulous Captain Holmes. His arc as a character involves shaking this lack of independence off.