Quotes from Thomas Robert Malthus

Population, when unchecked, increases in a geometrical ratio. Subsistence only increases in an arithmetical ratio.

The histories of mankind that we possess are histories only of the higher class.

Population, when unchecked, increases in a geometrical ratio. Subsistence increases only in an arithmetical ratio. A slight acquaintance with numbers will show the immensity of the first power in comparison of the second.