For any being to exist, energy is required, and energy can be produced only through give and take action. However, nothing can reciprocate without a partner.
To generate the forces necessary for existence, a being must contain dual characteristics, a subject partner and an object partner, which can engage in give-and-take action.
A movement in a straight line cannot be sustained forever. For anything to have an eternal nature it must move in a circle; give and take action between a subject partner and an object partner is necessary for any circular motion. This is true even for God; having dual characteristics allows Him to live eternally. In order for God’s creation to resemble His eternal nature and be His eternal object partner, it likewise must be composed of dual characteristics. Similarly, time maintains its perpetuity through its periodic cycles.
Sun Myung Moon