swords, less sharp, may strike a bone and glance off and not penetrate. Some swords may penetrate partway through the tough, thick joint of a bone. But a very sharp, powerful double-edged sword (sharp on each side of the point) will penetrate the joint all the way to the marrow. “Soul and spirit” are like “bone joint and bone marrow.” “Soul” is that invisible dimension of our life that we are by nature. “Spirit” is what we are by supernatural rebirth. Jesus said, “That which is born of the flesh
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