When your mind has a clearly defined target, it can focus and direct your thoughts and actions until it reaches its intended goal. Without a definite target, your mind's energy is wasted. When you know your outcome, your mind has a clear picture of which pieces of information being received need highest priority. You mind needs a clear message to be effective. The reason so many people fail to achieve their goals in life is because they never really set them in the first place.
Most people spend more time planning a vacation than they do planning their lives.
You need to decide what you want because that is the only way you can get it. Knowing what you want determines what you get. An often cited study conducted of the 1953 Yale University graduating class underscores the power of deciding what you want. The graduates were asked if they had a clear, specific set of written goals, with a plan for achieving those goals. Twenty years later, the surviving members of the 1953 graduating class were interviewed again.