"Real happiness is not dependent on external things. The pond is fed from within. The kind of happiness that stays with you is the happiness that springs from inward thoughts and emotions. You must think of this now, while you are young. You must cultivate your mind if you wish to achieve enduring happiness. You must furnish your mind with interesting thoughts and ideas. For an empty mind grows bored and cannot endure itself. An empty mind seeks pleasure as a substitute for happiness."
--William L. Phelps
"The happiest person is the person who thinks the most interesting thoughts."