When you go out on a boat and look around, you feel as if the shore were moving. But if you fix your eyes on the rim of the boat, you become aware that the boat is moving. It is exactly the same when you try to know the objective world while still in a state of confusion in regard to your own body and mind; you are under the misapprehension that your own mind, your own nature, is something real and enduring [while the external world is transitory]. Only when you sit straight and look into yourself, does it become clear that [you yourself are changing ] the objective world has a reality apart from you.

(The Shobo Genzo)