Attract Happiness and Good Fortune- by Napoleon Hill

Remember, every person lives in two worlds: the world of his own mental attitude, which is greatly influenced by his associates and his surroundings, and the physical world in which he must struggle for a living. The physical world in which you make a living may be beyond your control, but you can, to a great extent, shape the circumstances of your immediate physical world. It can be done by the way you relate yourself to your mental world, for your mental attitude attracts to you those aspects of the physical world which harmonize with your mental attitude. Thus, pessimism will attract misery and ill fortune. But enthusiasm, properly controlled, will attract happiness and good fortune.
Enthusiasm is a great leavening force in your mental world, for it gives power to your purpose. It helps to free your mind of negative influences and brings you peace of mind. It wakens your imagination and stirs you to shape the circumstances of your physical world to meet your own needs.
But no amount of enthusiasm can replace definiteness of purpose. A man without a definite major purpose resembles a locomotive without a track to run on, or a destination toward which to travel. And if he lacks enthusiasm to back his definite major purpose, he is like a locomotive without fuel.
Enthusiasm may be expressed in two ways: passively, through the stimulation of emotional feeling which inspires you to meditate and think in silence; and actively, by the expression of such feeling through words and deeds.
Source:  PMA Science of Success. Educational Edition. The Napoleon Hill Foundation. 1983. Pg. 250.
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