It is a mistake to suppose that all change or development is growth. The present condition of the earth’s surface is not mature or immature; the hors… - B. F. Skinner

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It is a mistake to suppose that all change or development is growth. The present condition of the earth’s surface is not mature or immature; the horse has not, so far as we know, reached some final and presumably optimal stage in evolutionary development. If a child’s language seems to grow like an embryo, it is only because the environmental contingencies have been neglected. The feral child has no language, not because his isolation has interfered with some growth process, but because he has not been exposed to a verbal community. We have no reason to call any culture mature in the sense that further growth is unlikely or that it would necessarily be a kind of deterioration. We call some cultures underdeveloped or immature in contrast with others we call ‘advanced’, but it is a crude form of jingoism to imply that any government, religion, or economic system is mature.

The main objection to the metaphor of growth, in considering either the development of an individual or the evolution of a culture, is that it emphasizes a terminal state which does not have a function. We say that an organism grows toward maturity or in order to reach maturity. Maturity becomes a goal, and progress becomes movement towards a goal. A goal is literally a terminus — the end of something such as a foot race. It has no effect on the race except to bring it to an end. The word is used in this relatively empty sense when we say that the goal of life is death or that the goal of evolution is to fill the earth with life. Death is no doubt the end of life, and a full world may be the end of evolution, but these terminal conditions have no bearing on the processes through which they are reached. We do not live in order to die, and evolution does not proceed in order to fill the earth with life.