„Putting an end to the population explosion will not of itself save the ecosphere, but not ending it will add greatly to the dangers the planet faces. The environment can sustain a quality of life for just so many people.“

— Michael Parenti

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„Life is not merely persistent, as Jock puts it; life is explosive. The basic theorem of population mathematics to which there has never been found an exception is that population increases always, not merely up to the extent of the food supply, but beyond it, to the minimum diet that will sustain life—the ragged edge of starvation.“
— Robert A. Heinlein
„Education is perceived as a crucial instrument for increasing productivity and income, skills, competency of human resources, and sustainable growth. In the end, education helps reduce social problems, and improves quality of life so that people can live equally with others in society.“
— Sukavich Rangsitpol
„As for population, every major shortcoming of our native planet could be traced to one cause: too many people, not enough planet.“
— Robert A. Heinlein
„Further, an excess of legislation defeats its own ends. It makes the whole population criminals, and turns them all into police and police spies. The moral health of such a people is ruined for ever; only revolution can save it.“
— Aleister Crowley
„God wants us to know we are saved, for saved people are dangerous people, willing to face off with the world, unafraid of the consequences since they know that, whatever happens, they will have eternal life.“
— Max Lucado