Poseidon’s spear, that scourge of the sea and shaker of the land.The poet adopts the legend that Poseidon was a rival with Zeus for the hand of Thetis, of whose son it had been prophesied by Themis that he should be mightier than his father. The prophecy was fulfilled in the person of Peleus’ son, Achilles.Then, wrecked upon this evil, Zeus shall learn how different it is to be a sovereign and a slave. ChorusSurely, it is only your own desire that you utter as a curse against Zeus. PrometheusI speak what shall be brought to pass and, moreover, my own desire.