Well, think about it. If you had the power to look at what your life will be like 15 years from now, do you honestly think your life would end up that way? Wouldn't the very fact that you know how things would turn out change how you acted in the meantime, thus altering the vision you had?
Not so. You shape your future everytime you make a decision and take an action. Every action is a cause set in motion. A person can stop and take a look at where they are currently, ask themselves what the next five or ten years will be like if they never make any new decisions, any major decisions. If you always do what you have always done, you always have what you always had. In 10 years you will be exactly where you are today and have pretty much an unaltered life if you fail to make new and better decisions.
Just think tho, if you could look into the future and see where you would be if you made certain decisions or took a specific set of actions, would it not be a bit easier to get where you want to go? Boy o boy! The mistakes and pitfalls you could avoid as a result of seeing what will be if you were to take a certain action! What a difference you could make in other people's lives!
Corvin