Population, when unchecked, goes on doubling itself every 25 years or increases in a geometrical ratio.
Thomas MalthusPopulation, when unchecked, increases in a geometrical ratio. Subsistence increases only in an arithmetical ratio. A slight acquaintance with numbers will shew the immensity of the first power in comparison of the second.
Thomas MalthusThe great and unlooked for discoveries that have taken place of late years have all concurred to lead many men into the opinion that we were touching on a period big with the most important changes.
Thomas MalthusIt is also very important to observe, that menial servants are absolutely necessary to make the resources of the higher and middle classes of society efficient in the demand for material products.
Thomas Malthus