Concentration is the great secret of power. If you want to use your full amount of steam, you must close your valves and direct your power of generating mental steam toward one end. Center your mind on one purpose, one plan and one transaction at any one time. Just as it is impossible for a steam engine to run with all its valves open, so is it impossible for you to waste your energy and run at your top speed. The difference in manifestation of power among men lies in the difference of their concentration.

Through concentration you can get anything you want. Every desire can be  gratified. But whether it is, will depend upon you concentrating to have that desire fulfilled. When you focus on what you want in order to manifest it, you are concentrating your power towards it. The greatest manifestors are the ones with the greatest concentration. The most successful people are those with the greatest focus. Concentration in its intensity and duration is the key of all perseverance, diligence, patience and will power.