The more specific our goal or dream, the more likely we will fulfill it.
Specifying accomplishes several things:
More realistic through reality-testing
As we specify, more parts of our mind are involved in the effort. The conscious and subconscious become involved to break the dream into parts. We optimize those parts to the framework of reality, making the dream more possible and then more probable and reality-matched with each step we bring detail to.
Easier and more attainable
As the dream is broken into smaller parts, the smaller parts become easier to accomplish than the entire project.
More likely to bring the goal to completion
As we finish each smaller part, we become more competent and capable of fulfilling the rest of the parts.