In essence, its what makes this Work worth doing.
The Work itself changes how you relate to the land you're on and the spirits upon it, creating a sensory awareness of the flows at hand. When this occurs, it can change the way you interface with those entities and powers by changing the way you feel and sense them. This shift in sensory awareness then dictates your cognizance of the flow within the land and, in turn, increases your ability to work with these forces.
This is where meditation comes in as an important tool, as it creates body and spirit awareness while creating emotional awareness. While you Work, be mindful of any felt shifts, however small, and attempt to ascertain their nature. If you can learn to do so, you'll find yourself better prepared to interface correctly, which in turn creates more powerful magic.
Pro tip. ;)