Madness, again, according to him, was the opposite of Wisdom. Nevertheless he did not identify Ignorance with Madness; but not to know yourself, and to assume and think that you know what you do not, he put next to Madness. “Most men, however,” he declared, “do not call those mad who err in matters that lie outside the knowledge of ordinary people: madness is the name they give to errors in matters of common knowledge.