Antoine de Saint Exupery said, "If you want to build a ship, don't drum up people to gather wood, divide the work, and give orders. Instead, teach them to yearn for the vast and endless sea."
Saint Ex had it right; images are powerful. Leaders know that the best way to get people to follow is to create an intricate, vivid picture of the goal. The old saying is "seeing is believing". We need to start 'seeing' what we want, instead of hoping we get it. Our minds tend to form a path toward whatever goal we focus on most. Seeing is reality, even, or perhaps especially, mental visualization.