“Scientific truth is beyond loyalty and disloyalty.”

“The finest proof of our loyalty toward one another was our monstrous disloyalties towards everyone else.”

“Perhaps, indeed, there are no truly universal ethics: or to put it more precisely, the ways in which ethical principles are interpreted will inevitably differ across cultures and eras. Yet, these differences arise chiefly at the margins. All known societies embrace the virtues of truthfulness, integrity, loyalty, fairness; none explicitly endorse falsehood, dishonesty, disloyalty, gross inequity. (Five Minds for the Future, p136)”

“There's loyalty that protects secrets and loyalty that protects truth. You cannot serve them both.”

“Loyalty is the pledge of truth to oneself and others.”

“That which Voldemort does not value, he takes no trouble to comprehend. Of house-elves and children’s tales, of love, loyalty, and innocence, Voldemort knows and understands nothing. Nothing. That they all have a power beyond his own, a power beyond the reach of any magic, is a truth he has never grasped.”