To live is not to breathe but to act. It is to make use of our organs, our senses, our faculties, of all the parts of ourselves which give us the sentiment of our existence. The man who has lived the most is not he who has counted the most years but he who has most felt life.
In the most general terms, the Enlightenment goes back to Plato's belief that truth and beauty and goodness are connected; that truth and beauty, disseminated widely, will sooner or later lead to goodness. (While we're making at effort at truth and goodness, beauty reminds us what we're hold out for.)
Do not look for happiness outside yourself. The awakened seek happiness inside.