Whenever a person strives, by the help of dialectic, to start in pursuit of every reality by a simple process of reason, independent of all sensuous information -- never flinching, until by an act of the pure intelligence he has grasped the real nature of good -- he arrives at the very end of the intellectual world.
Plato (ca. May 21? 427 BC ca. 347 BC) was an immensely influential classical Greek philosopher, student of Socrates, teacher of Aristotle, writer of philosophical dialogues, and founder of the Academy in Athens.