Darwin tells us that "there is no exception to the rule that every organic being naturally increases at such a high rate that, if not destroyed, the earth would soon be covered by the progeny of a single pair. Even slow-breeding man has doubled in twenty-five years, and at this rate in less than a thousand years there would literally not be standing room for his progeny." [144] [I commend this passage to the notice of President Roosevelt and others who are so anxious that we should obey God's command to Noah, and "be fruitful and multiply, and replenish the earth."] "If all the offspring of the elephant, the slowest breeder known, survived, there would be, in seven hundred and fifty years, nearly nineteen million elephants, descended from the first pair. If the eight or nine million eggs which the roe of a cod is said to contain, developed into adult codfishes, the sea would quickly become a solid mass of them. It is the same with the plants. The lower organisms multiply with an astonishing rapidity, some minute fungi increasing a billion-fold in a few hours. But we need not give further examples of this fecundity whereby Nature, 'so careless of the single life,' secures the race against extinction. The result is obvious--a ceaseless struggle for food and place. In that struggle the race is to the swift, and the battle to the strong; the weaker, be it in brain or body, going to the wall; the vast majority never reaching maturity, or, if they do, attaining it only to be starved or slain. As among men competition is sharper between those of the same trade, so throughout the organic world the struggle is less severe between different species than between members of the same species, because these compete more fiercely for their common needs--plants for the same soil, carnivora for the same prey." [145] The problem of evil has exercised the mind of man from all time, and has never yet been solved. In our own time the solution by theology seems farther off than ever, now that the existence of the Devil is denied, while the law of prey and struggle for existence is admitted to be the Creator's own handiwork--to be His Divine plan for the evolution of all living things. Surely we must admit the inherent cruelty of the process? Professor Huxley, in an article on the "Struggle for Existence," concludes that, "since thousands of times a minute, were our ears sharp enough, we should hear sighs and groans of pain like those heard by Dante at the gate of hell [not to mention what we should not hear--the anguish and terror borne in silence], the world cannot be governed by what we call benevolence." [146]