A writer may tell me that he thinks man will ultimately become an ostrich. I cannot properly contradict him. But before he can expect to bring any reasonable person over to his opinion, he ought to shew, that the necks of mankind have been gradually elongating; that the lips have grown harder and more prominent; that the legs and feet are daily altering their shape; and that the hair is beginning to change into stubs of feathers. And till the probability of so wonderful a conversion can be shewn, it is surely lost time and lost eloquence to expatiate on the happiness of man in such a state; to describe his powers, both of running and flying; to paint him in a condition where all narrow luxuries would be contemned; where he would be employed only in collecting the necessaries of life; and where, consequently, each man’s share of labour would be light, and his portion of leisure ample.
(T. R. “Bob” Malthus, An Essay on the Principle of Population, 1st ed. , pp. 11-12)