External force

Definition and stakes

Portrait of Titus Lucretius Carus Titus Lucretius Carus,  On the Nature of Things

“ So seest thou not, how, though external force Drive men before, and often make them move, Onward against desire, and headlong snatched, Yet is there something in these breasts of ours Strong to combat, strong to withstand the same?— Wherefore no less within the primal seeds Thou must admit, besides all blows and weight, Some other cause of motion, whence derives This power in us inborn, of some free act.— Since naught from nothing can become, we see. ”
Source: Gutenberg

Portrait of Herbert Spencer Herbert Spencer,  The Principles of Biology — Chapter III.12 (1898)

“ If the alteration of some external factor is so great that it leaves alive only the few individuals possessing extreme endowments of the power required to antagonize it; then, in succeeding generations, there is a rapid multiplication of individuals similarly possessing extreme endowments of this power—the force impressed calls out an equivalent conflicting force. ”
Source: Wikisource

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