Imagine what it must have been like to be one of the men on Christopher Columbus' journey to discover the New World. You're worried the world is flat and you will fall off the edge, you don't really know where you are (it was impossible to measure longitude back then), and for 70 days every day looked exactly like the one before.
When your team is in the middle of a journey of change, it can be difficult to see the progress being made and easy to feel that everyday is more or less the same as what was there before.
If you've ever undertaken a personal change effort, whether it's losing weight or learning to play a musical instrument, you'll know that day-to-day nothing looks different. But then someone you haven't seen in a while gives you a positive remark and you realize how far you've come.
Part of your role as a change leader then is to hold up a mirror, observing the progress being made and reflecting it back to the team so they can see it as well.
Knowing that others can see the work being accomplished is a powerful motivator.