The Perpetual Struggle For Room And Food.

Population, When Unchecked, Goes On Doubling Itself Every 25 Years Or Increases In A Geometrical Ratio.

The Moon Is Not Kept In Her Orbit Round The Earth, Nor The Earth In Her Orbit Round The Sun, By A Force That Varies Merely In The Inverse Ratio Of The Squares Of The Distances.

It Has Been Said, And Perhaps With Truth, That The Conclusions Of Political Economy Partake More Of The Certainty Of The Stricter Sciences Than Those Of Most Of The Other Branches Of Human Knowledge.

Evil Exists In The World Not To Create Despair But Activity.

The Natural Inequality Of The Two Powers Of Population And Of Production In The Earth, And That Great Law Of Our Nature Which Must Constantly Keep Their Efforts Equal, Form The Great Difficulty That To Me Appears Insurmountable In The Way To The Perfectibility Of Society.