Vitae philosophorum

Philosophy has three parts, physics, ethics, and dialectic or logic. Physics is the part concerned with the universe and all that it contains; ethics that concerned with life and all that has to do with us; while the processes of reasoning employed by both form the province of dialectic. Physics flourished down to the time of Archelaus; ethics, as we have said, started with Socrates; while dialectic goes as far back as Zeno of Elea. In ethics there have been ten schools: the Academic, the Cyrenaic, the Elian, the Megarian, the Cynic, the Eretrian, the Dialectic, the Peripatetic, the Stoic, and the Epicurean.