申論題

       The first element which differentiates human from animal existence is a negative one: the relative absence in man of instinctive regulation in the process of adaptation to the surrounding world. The mode of adaptation of the animal to its world remains the same throughout. If its instinctive equipment is no longer fit to cope successfully with a changing environment, the species will become extinct. The animal can adapt itself to changing conditions by changing itself. In this fashion, it lives harmoniously, not in the sense of absence of struggle but in the sense that its inherited equipment makes it a fixed and unchanging part of its world; it either fits in or dies out.