LEMMA III. A body in motion or at rest must be determined to motion or rest by another body, which other body has been determined to motion or rest by a third body, and that third again by a fourth, and so on to infinity.
Lemma III. eta gorputz hau beste batek determinatu du mugitzera edo geldirik egotera; eta azken hau, bere aldian, beste batek; eta, horrela, azkenik gabe.