With regard to the duration of human life, there does not appear to have existed from the earliest ages of the world to the present moment the smallest permanent symptom or indication of increasing prolongation.
Thomas MalthusThe power of population is so superior to the power of the earth to produce subsistence for man, that premature death must in some shape or other visit the human race.
Thomas MalthusPopulation, when unchecked, goes on doubling itself every 25 years or increases in a geometrical ratio.
Thomas Malthus