Thomas Malthus

The histories of mankind are histories only of the higher classes.

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

Population, when unchecked, increases in a geometrical ratio.

Many transition states have a well-defined preferred geometrical requirement.

God has always worked wonders through his prophets to increase the faith of His chosen people or to correct their disobedience.

Think of the earth as a living organism that is being attacked by billions of bacteria whose numbers double every forty years. Either the host dies, or the virus dies, or both die.