Sentence:  What's an Eternal Circulation of the ſame Things, as well as the ſame Steps, without Advancing one Inch of Ground towards his Journey's End, but "Ixion" in the "Wheel"? And all this while, with Cares, and Horrors at his Heart, like the "Vultur" that's Day and Night <WSD>Quarrying</WSD> upon "Prometheus's Liver". 
Meaning of the word marked with <WSD> tags:  To secure prey; to prey, as a vulture or harpy.