Amitabha! Senior brother, this means: The Tao is originally like this, too ordinary, so it cannot be described; the truth is like this, the simplest, even inconceivable!
The Buddha-nature and Zen mind are everywhere and present everywhere. Everything is everywhere right now. If you realize the Buddha-nature and Zen mind, lighting a fire to cook, carrying water and chopping wood are all practices.
If you don’t know it, you can read through the twelve volumes of the Tripitaka and travel to every corner of the world, but you still can’t see it!