Aristotle, Nicomachean Ethics
H. Rackham, Ed.

[16] And for this very reason¹ men think that the just man will act unjustly no less than justly, because the just man is not less but rather more able than another to do any particular unjust thing: for example, he can lie with a woman, or strike a blow, and a brave man can throw away his shield, and can wheel to the right or left and run away. But to be a coward and to be guilty of injustice consists not in doing these things （except accidentally）, but in doing them from a certain disposition of mind; just as to be a physician and cure one's patients is not a matter of employing or not employing surgery or drugs, but of doing so in a certain manner.