The way of health is to follow the Tao.
That is why the alchemist possesses radiance.
How can he follow the Tao, if it is un-graspable?
He can follow it because
He doesn’t try to hold it like a dogma.
If the Tao is dark and vast, how can he be radiant?
He is radiant because the Tao is the source of health.
The Tao was present before creation.
How does the alchemist know this?
He knows by looking inside himself.