One of the biggest reasons people fail to get their dreams and desires is because of their lack of DECISION. All successful people have learned the value of making a decision and sticking to that choice. It's not a skill, it's a mindset.  

A wishy washy mind that fails to make quick and resolved decisions is a mind that will chase many things and finish few. That's why Napoleon Hill listed Decision as one of the 13 principles of success in his success class Think & Grow Rich.