Epictetus

"True philosophy doesn't involve exotic rituals, mysterious liturgy, or quaint beliefs. Nor is it just abstract theorizing and analysis. It is, of course, the love of wisdom. It is the art of living a good life. As such, it must be rescued from religious gurus and from professional philosophers lest it be exploited as an esoteric cult or as a set of detached intellectual techniques or brain teasers to show how clever you are. Philosophy is intended for everyone, and it is authentically practiced only by those who wed it with action in the world toward a better life for all.

"Philosophy's purpose is to illuminate the ways our soul has been infected by unsound beliefs, untrained tumultuous desires, and dubious life choices and preferences that are unworthy of us. Self-scrutiny applied with kindness is the main antidote. Besides rooting out the soul's corruptions, the life of wisdom is also meant to stir us from our lassitude and move us in the direction of an energetic, cheerful life."