No limits whatever are placed to the productions of the earth; they may increase forever.

Every endeavor should be used to weaken and destroy all those institutions relating to corporations, apprenticeships, &c, which cause the labours of agriculture to be worse paid than the labours of trade and manufactures.

The most effectual encouragement to population is, the activity of industry, and the consequent multiplication of the national products.

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.

[P]opulation, when unchecked, goes on doubling itself every twenty-five years, or increases in a geometrical ratio. ... [T]he means of subsistence, under circumstances the most favorable to human industry, could not possibly be made to increase faster than in an arithmetical ratio.

No move towards the extinction of the passion between the sexes has taken place in the five or six thousand years that the world has existed.

It is not the most pleasant employment to spend eight hours a day in a counting house.