Often, we want to be shown the big picture but it is not always in our best interest as we can easily become overwhelmed.
Just think of your life as you've lived it up to this point. If you are like most of us, you have probably done more and faced more than you could have ever imagined. If someone had told you as a child of all the jobs and relationships you would experience, along with each one's inherent ups and downs, you would have become overwhelmed. With your head full of information about the future, you would have had a very hard time experiencing your life in the present moment, which is where everything actually happens.
In many ways, not knowing what the future has in store brings out in us the qualities we need to grow. For example, it would have been difficult to commit yourself to certain people or projects if you knew they wouldn't ultimately work out. Yet, it was through your commitment to see them through that you experienced the lessons you needed to grow. Looking back on your life, you would likely be hard pressed to say that anything in your past should not have happened. In fact, your most challenging experiences with their inevitable lessons may have ultimately brought you the greatest rewards. Not knowing the future keeps us just where we need to be--fully committed and in the present moment.