The fact is: you want to be perfectly happy, but you are not. Your life has been a series of disappointments, shocks, and disillusionments. How have you reacted to your disappointments? Either you became cynical or else you became religious. If you became cynical, you blamed things rather than yourself. [....] In every instance, you made happiness extrinsic to yourself. No wonder you are never happy. You are chasing mirages until death overtakes you. But cynicism did not work, because in seeking pleasures you missed the joys of life. Pleasure is of the body; joy is of the mind and heart. [....] You can quickly become tired of pleasures, but you never tire of joys. A pleasure can be increased to a point where it ceases to be a pleasure; it may even begin to be a pain if carried beyond a certain point[....]
Furthermore, have you noticed that as your desire for pleasure increased, the satisfaction from the pleasure decreased? Do you think a philosophy of life is right that is based on the law of diminishing returns? (emphasis mine) - Fulton Sheen - Are You Happy?