“I learned from my Arabian masters under the leading of reason; you, however, captivated by… authority, follow your halter. For what else should authority be called than a halter?” Those who are now counted as authorities gained their reputation by following reason, not authority. “Therefore,” he tells his nephew, “if you want to hear anything more from me, give and take reason…. Nothing is surer than reason… nothing is falser than the senses.”