“She breathed an enormous sigh, looked at Poirot, Looked away, and suddenly blurted out, "You're too old. Nobody told me you were so old. I really don't want to be rude but - there it is. You're too...”

“Eh bien, then, you are crazy, or appear crazy or you think you are crazy, and possibly you may be crazy.”

“Theres no way you can kill someone and get to the other side of the experience unchanged.”

“Why do we electrocute men for murdering an individual and then pin a purple heart on them for mass slaughter of someone arbitrarily labeled enemy?”

“He had also learned that there is no use murdering people; there are always so many left, and if you tried to murder them all you would never get anything else done.”