Happiness depends upon ourselves.

Aristotle (385–322 BCE) was a Greek philosopher who lived in Ancient Greece during the Classical period. He was a student of Plato and was the founder of the Lyceum school of philosophy and the Aristotelian tradition. His teachings cover many subjects including physics, biology, zoology, metaphysics, logic, ethics, aesthetics, poetry, theatre, music, rhetoric, psychology, linguistics, economics, politics, and government.