The germs of existence contained in this spot of earth, with ample food, and ample room to expand in, would fill millions of worlds in the course of a few thousand years.

The power of population is indefinitely greater than the power in the earth to produce subsistence for man.

In general it may be said that demand is quite as necessary to the increase of capital as the increase of capital is to demand.

Evil exists in the world not to create despair but activity.

The constant effort towards population, which is found even in the most vicious societies, increases the number of people before the means of subsistence are increased.

Population, when unchecked, goes on doubling itself every 25 years or increases in a geometrical ratio.

Population, 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.