The vis insita, or innate force of matter, is a power of resisting by which every body, as much as in it lies, endeavours to preserve its present state, whether it be of rest or of moving uniformly forward in a straight line.

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Quote text and notes from Wikiquote: Isaac Newton (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.