It is an acknowledged truth in philosophy that a just theory will always be confirmed by experiment.

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.

Had population and food increased in the same ratio, it is probable that man might never have emerged from the savage state.

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.

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

[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.

A writer may tell me that he thinks man will ultimately become an ostrich. I cannot properly contradict him.