Power's nature is to be great
  iff it follows the Way.
The Way is the real thing
  iff it is waxing,
  iff it is waning.

Waxing, oh!
Waning, oh!
  Its kernel holds the classes.
Waning, oh!
Waxing, oh!
  Its kernel holds the objects.
Profound, oh!
Obscure, oh!
  Its kernel holds the essence.

This essence is very real;
  its kernel holds the truth.

From now back to the Elder Days,
  its name has never been lost.

Thus it tracks the common source.
How do I grok the common source?
By this.

[Credit: sbp pointed out the lunar imagery.]