The universe itself is an organic whole, alive, intelligent, and divine. Every aspect of it, including humanity, is in process of constant change, subject to the immutable law of karma, which ensures that balance and harmony are restored and maintained.
Nature is an ebb and flow which regulates the evolution and involution of all life forms.
The purpose of evolution is to gain experience and self-awareness of the universe's primal nature, which is compassion. Involution is the returning to this primal source with the experiences gained during manifestation. After a period of rest further reimbodiments take place to continue the evolutionary process. Humanity, through innumerable cycles, has become aware of the spiritual source, the greater life. The ego, vehicle of the lower self and body, is subject to the impulse to gain further experience.