You will find yourself refreshed by the presence of cheerful people. Why not make earnest effort to confer that pleasure on others?...half the battle is gained if you never allow yourself to say anything gloomy.
You wear yourself out in the pursuit of wealth or love or freedom, you do everything to gain some right, and once it's gained you take no pleasure in it.
You think of yourself as a citizen of the universe. You think you belong to this world of dust and matter. Out of this dust you have created a personal image, and have forgotten about the essence of your true origin.