If your virtue is especially radiant, it can be possible to open a pathway to the subtle realm and receive these celestial teachings directly from the immortals.
Thirty spokes meet in the hub,
but the empty space between them
is the essence of the wheel.
Pots are formed from clay,
but the empty space within it
is the essence of the pot.
Walls with windows and doors
form the house,
but the empty space within it
is the essence of the home.