一伊壁鸠鲁认为,重力是物质的根本而固有的性质。但牛顿反对这一种说法,“重力比如是由一个按一定规律行事的主宰所造成,但这个主宰是物质的还是非物质的,我却留给了读者自己去考虑”。牛顿并不奢望理解重力产生的原因,他看见有这么一种力量的存在,用辛勤的测算找到它的规律,并用它解释大到星辰小到原子的运动。“物体为重力所吸向地球, An Epicurean believes that gravity is the fundamental nature of matter. But Newton objected to this argument. ”Gravity, for example, was caused by a dominating act, but whether this dominion is material or immaterial, but I leave the reader himself to consider.“ Newton did not expect to understand the causes of gravity. He saw the existence of such a force, finding its law with diligent calculations and using it to explain the movement from small stars to atoms. ”Objects are drawn to the earth by gravity,