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| (63) Dico igitur quod causa huius elevationis efficiens non potest esse terra ipsa; quia cum elevari sit quoddam ferri sursum, et ferri sursum sit contra naturam terre, et nichil, per se loquendo, possit esse causa eius quod est contra suam naturam, relinquitur quod terra huius elevationis efficiens causa esse non possit. | (63) I say, then, that the efficient cause of this elevation cannot be earth herself; for, since being elevated is a kind of impulse upward, and an impulse upward is contrary to the nature of earth, and nothing can, in itself, be the cause of what is contrary to its own nature, it remains that earth cannot be the efficient cause of this elevation. |