The great and unlooked for discoveries that have taken place of late years in natural philosophy; the increasing diffusion of general knowledge from the extension of the art of printing; the ardent and unshackled spirit of inquiry that prevails throughout the lettered, and even unlettered world; the new and extraordinary lights that have been thrown on political subjects, which dazzle, and astonish the understanding […] have all concurred to lead many able men into the opinion, that we were touching on a period big with the most important changes, changes that would in some measure be decisive of the future fate of mankind.

Thomas R. Malthus, An essay on the princicple of population, as it affects the future improvement of society, London, 1798, pp. 1-2