Homo sum, et nihil humani a me alienum puto
From The Art and Popular Culture Encyclopedia
"Homo sum, humani nihil a me alienum puto" ("I am a man, I think nothing human alien to me") is the latin translation of a Greek line from the play "The Self-Tormentor" by New Comedy playwright Menander that Terence adapted. It is translated in English as "I am a man, I consider nothing that is human alien to me."
It was quoted in a different form by Dostoyevsky ("But you've only to assume that I, too, am a man /et nihil humanum/" in Crime and Punishment and as "Сатана sum et nihil humanum" in The Brothers Karamazov.