This quote comes from Aristotle's 'Nicomachean Ethics', where he develops his concept of eudaimonia - a deeper form of happiness that goes beyond mere pleasure. Aristotle argues that true happiness comes from living virtuously and realizing one's full potential. This isn't about momentary pleasure but about achieving excellence in thought and character throughout life. His perspective revolutionized ancient Greek philosophy and continues to influence modern positive psychology and theories of human flourishing.