Happiness is impossible, and even inconceivable, to a mind without scope, and without pause, a mind driven by craving, pleasure or fear. To be happy, you must be reasonable, or you must be tamed. You must have taken the measure of your powers, tasted the fruits of your passion, and learned your place in the world and what things in it can really serve you. To be happy you must be wise.

-- G. Santayana