Wipe the dust from the windowsill only to have it return. There is no end, only infinity. The sun rises, sets, and then rises again. The moon crosses the sky. The Tao has unlimited depth. How could we possible hope to know its deepest secrets? It is not the deepest secrets that should matter the most anyway to us, it should be the obvious it shows us which we too often are oblivious to. Everything is Tao. Everything is not Tao. There is reality and there is truth. You are you yet you are not you. This cloud will soon pass leaving us to a sky full of uncertainness. Yet just as nothing truly exists, all things exist in the universe and within Tao. Everything else is illusion, guesswork, and ignorance.