The first celebrity of Greek philosophers is Socrates who gained his fame through help of his students, namely through Xenophon, Plato, and Aristotle. According to Socrates, virtue is a form of knowledge and thus something that could be taught to people. Only the virtues citizens should hold is the power of ruling. He was not interested in dealing with logic, nor chemistry and physics. Socrates was an admirer of knowledge and wisdom. According to him, everyday life of society should not be governed by ordinary citizens, who do not have adequate wisdom and knowledge.