The main principles at work in the creation are place, separation, motion, and life, but especially separation and motion.”73 He points out that the language gives strong support to the idea of separation, with “divide” or “separate” occurring five times explicitly and ten times implicitly in the phrase “after its kind.” God divides the light from the darkness; the heavenly lights divide day from night; the firmament or vault of heaven divides the waters above from those below, whereas the creatures without external intervention maintain the distinctiveness of their species by reproducing
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