it doesn't keep anything in it, it is said that the mind is empty. If emptiness
is seen as empty, emptiness is still not empty. When empty and mindless of
emptiness, this is called true emptiness.
1.
XI. The Intercourse of Water and Fire
1. Whenever you leak vital spirit, being stirred and interacting with beings,
that is all fire. Whenever you gather back spirit's consciousness and quiet it
down to steep in the center that is all water. When the senses run outward,
that is fire; when the senses turn around inward, that is water.
2. The one yin [inside the fire trigram] concentrates on pursuing sense
experience, while the one yang [inside the water trigram] concentrates on
reversing and withdrawing the senses themselves.