Here is an excerpt from my book, The Silent Master: Awakening the Power Within:
We have seen how your will power is like an engine that drives you along your path and how motivation is like the fuel feeding the engine; think of attitude as that which determines the quality of the fuel.
Positive attitudes are like high energy fuel, such as high octane gas. Negative attitudes are like impure gasoline. When you put this kind of gasoline into your car, you will undoubtedly see trouble in the engine before long. Just so, negative attitudes create obstruction and conflict in your life.