Population, when unchecked, increases in a geometrical ratio. – Thomas Robert Malthus

The purpose of population is not ultimately peopling earth. It is to fill heaven. – Graham D. Leonard

The world is populated in the main by people who should not exist. – George Bernard Shaw

The hungry world cannot be fed until and unless the growth of its resources and the growth of its population come into balance. Each man and woman-and each nation –must make decisions of conscience and policy in the face of this great problem. – Lyndon B. Johnson