" As the American educator William L. Phelps noted, “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 cultivate your mind if you wish to achieve enduring happiness. You must furnish your mind with interesting thoughts and ideas. For an empty mind seeks pleasure as a substitute for happiness. "

― Napoleon Hill , Napoleon Hill's Positive Action Plan: 365 Meditations For Making Each Day a Success