"Nice people care if you like them; good people care about you. Nice people stretch the truth; good people don’t. If you tell a nice person to do something evil, they might do it because they do not want to upset you; a good person will refuse to do it.
You might think you are a good person, but you are fallible, so if you want to avoid inadvertently doing something evil you must surround yourself with good people, not nice people."

Not sure I agree with the premise (that there's a difference between being 'nice' and being 'good'), but certainly makes for an interesting employee selection process.