“The enemy is anybody who's going to get you killed, no matter which side he is on.”

“The enemy," retorted Yossarian with weighted precision, "is anybody who's going to get you killed, no matter which side he's on, and that includes Colonel Cathcart. And don't you forget that, because the longer you remember it, the longer you might live.”

“People go funny in the head when talking about politics. The evolutionary reasons for this are so obvious as to be worth belaboring: In the ancestral environment, politics was a matter of life and death. And sex, and wealth, and allies, and reputation... When, today, you get into an argument about whether "we" ought to raise the minimum wage, you're executing adaptations for an ancestral environment where being on the wrong side of the argument could get you killed. Being on the right side of the argument could let you kill your hated rival![...]Politics is an extension of war by other means. Arguments are soldiers. Once you know which side you're on, you must support all arguments of that side, and attack all arguments that appear to favor the enemy side; otherwise it's like stabbing your soldiers in the back—providing aid and comfort to the enemy. People who would be level-headed about evenhandedly weighing all sides of an issue in their professional life as scientists, can suddenly turn into slogan-chanting zombies when there's a Blue or Green position on an issue.”

“Revenge is never what you think it's going to be. There's no pleasure and glory, and when it's done your grief remains. Once a man does the things you're talking about, he will never be the same, and he can never go back to who he was before. Worst of all, no matter how many enemies you kill, you are never satisfied. There is always one more who deserves it. When it becomes too easy to kill, it never ends.”

“Routine is the one thing the can get you killed. It tells the enemy where you're going and when you're going to be there.”

“Everyone is a moon, and has a dark side which he never shows to anybody.”