The passion between the sexes has appeared in every age to be so nearly the same, that it may always be considered, in algebraic language as a given quantity.
Thomas MalthusIn general it may be said that demand is quite as necessary to the increase of capital as the increase of capital is to demand.
Thomas MalthusThe power of population is indefinitely greater than the power in the earth to produce subsistence for man.
Thomas Malthus