The perpetual tendency of the race of man to increase beyond the means of subsistence is one of the general laws of animated nature, which we can have no reason to expect to change.
Thomas MalthusHad population and food increased in the same ratio, it is probable that man might never have emerged from the savage state.
Thomas MalthusThe most effectual encouragement to population is, the activity of industry, and the consequent multiplication of the national products.
Thomas Malthus