So, the cells that make up the body of the human being, are in a constant state of change. But, the soul that guides the mental operation of a human being, remains intact forever. The soul passes from one living creature to another and goes up or down the scale of life according to its capability of stabilizing character within the physical bodies it supervises. The duty of the soul is to encourage the development of greater consciousness within the mental systems of living creatures in order to increase their usefulness. The cells of consciousness are developed to a larger capacity for absorbing intelligence by continuous exercise, just as the physical cells are developed to carry greater loads by continuous exercise.
Intelligence comes from knowledge.
Knowledge is truth. By gathering intelligence from knowledge, based upon truth, one develops and expands consciousness that increases his spirituality and leads him nearer to God. Within His plan of utilizing everything without the loss of anything, God created man and gave him a duty to perform. To do this duty He furnished him with a physical machine capable of thinking for himself. God made man a conscious machine.