In the world of knowledge, the essential Form of Good is the limit of our inquiries, and can barely be perceived; but, when perceived, we cannot help concluding that it is in every case the source of all that is bright and beautiful --in the visible world giving birth to light and its master, and in the intellectual world dispensing, immediately and with full authority, truth and reason --and that whosoever would act wisely, either in private or in public, must set this Form of Good before his eyes.
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.