True happiness comes from gaining insight and growing into your best possible self. Otherwise all you're having is immediate gratification pleasure, which is fleeting and doesn't grow you as a person.

Happiness is self-connectedness.

We are what we repeatedly do... excellence, therefore, isn't just an act, but a habit and life isn't just a series of events, but an ongoing process of self-definition.

For suppose that every tool we had could perform its task, either at our bidding or itself perceiving the need, and if-like the statues made by Dædalus or the tripods of Hephæstus, of which the poet says that "self-moved they enter the assembly of the gods" - shuttles in a loom could fly to and fro and a plectrum play a lyre all self-moved, then master-craftsmen would have no need of servants nor masters of slaves.

A friend is a second self, so that our consciousness of a friend's existence...makes us more fully conscious of our own existence.