When you ride in a boat and watch the shore, you might assume that the shore is moving. But when you keep your eyes closely on the boat, you can see that the boat moves. Similarly, if you examine myriad things with a confused body and mind you might suppose that your mind and nature are permanent. When you practice intimately and return to where you are, it will be clear that nothing at all has unchanging self.
From Enlightenment Unfolds: The Essential Teachings of Zen Master Dogen, edited by Kazuaki Tanahashi, page 36