He, therefore, who sets himself to act evilly and yet wishes others to be silent, is a witness against himself, for he wishes himself to be loved more than the truth, which he does not wish to be defended against himself. There is, of course, no man who so lives as not sometimes to sin, but he wishes truth to be loved more than himself, who wills to be spared by no one against the truth. Wherefore, Peter willingly accepted the rebuke of Paul; David willingly hearkened to the reproof of a subject. For good rulers who pay no regard to self-love, take as homage to their humility the free and sincere words of subjects. But in this regard the office of ruling must be tempered with such great art of moderation, that the minds of subjects, when demonstrating themselves capable of taking right views in some matters, are given freedom of expression, but freedom that does not issue into pride, otherwise, when liberty of speech is granted too generously, the humility of their own lives will be lost.
~St. Gregory The Great