"Sir, I'm a surgeon. Do you know what the aorta is? No? Do you want me to tell you how easily I could kill you just by, say, wrenching this pen between your ribs and giving it a good - hard - whack," he demonstrated the process by slapping himself on the wrist, "so that it rips upward and severs it? You'd drown in your own blood...but very slowly. Do you want some more examples? The kidneys, for one—"
"Quite enough, Janus, thank you."
— Translated quote from a Dutch action novel.
"Lots of ways to help people. Sometimes heal patients; sometimes execute dangerous people. Either way helps."
— Mordin Solus, Mass Effect 2
"I've done life; now I'm doing death."
— Dr. Ramzi, The Dead Pit
Knull: It's kind of odd for the Captain, isn't it? Using proper anesthesia and healing methods. He likes his victims to be awake while he's working.
Captain Snow: Why Knull, I'm hurt! After all, before I went to sea I was trained in medical college. I'm a doctor. It's my job to heal the sick and tend to the wounded.
Captain Snow Torture is what I do for fun.
The world preferred to forget that men who knew how to heal also knew how to kill.
"Vena cava! Heart starter! The doctor is in! Sane!"
— Angelspit (who use this trope a lot in their art and themes), "Vena Cava"
"When a doctor goes wrong he is the first of criminals. He has nerve and he has knowledge."
— Sherlock Holmes, "The Adventure of the Speckled Band"