Population, when unchecked, goes on doubling itself every 25 years or increases in a geometrical ratio.
Thomas Robert Malthus
More Thomas Robert Malthus quotes :
In a state therefore of great equality and virtue, where pure and simple manners prevailed, the increase of the human species would evidently be much greater than any increase that has been hitherto known.Thomas Malthus
I do not know that any writer has supposed that on this earth man will ultimately be able to live without food.Thomas Malthus