This principle enables man to reason intelligently from the known to the unknown. The principle of vibration. This principle explains that the difference between manifestations of matter, energy, mind and spirit result from varying rates of vibration. The principle of polarity. Opposites are identical but different in degree.
Opposites are only two extremes of the same thing, with many varying degrees between.
The pendulum swing manifests in everything, rhythm compensates. There is always an action and a reaction, an advance and a retreat. The principle of causation. The principle of Gender. Gender is in everything, everything has its masculine and feminine principles.