Institutio Oratoria

Others are the victims of a more arrogant form of sloth; they assume a stern air and let their beards grow, and, as though despising the precepts of oratory, sit for a while in the schools of the philosophers, that, by an assumption of a severe mien before the public gaze and by an affected contempt of others they may assert their moral superiority, while leading a life of debauchery at home. For philosophy may be counterfeited, but eloquence never.