As, apart from its intrinsic power, _Prometheus_ has an incidental interest in the history of philosophic thought, it may be worth while to sketch briefly the development it attained. When Prometheus is introduced to us, he is a rebel against Zeus and the other gods. He had rendered them allegiance so long as he believed that "they saw the past and the future in the present and were animated by self-originated and disinterested wisdom," but, on the discovery of his error, he had renounced their authority, and, as an independent agent, he had fashioned images of human beings, to which, however, he was powerless to give the breath of life. In the first Scene of the first Act, Mercury appears as the messenger of the gods and reasons with Prometheus on the folly of his contending with their omnipotence. Prometheus denies their omnipotence either over nature or over himself. "Can they separate me from myself?" he asks, and Mercury admits that the gods are subject to a power stronger than their own--the power of Fate. "Go, then," is the reply, "I do not serve vassals." After a brief soliloquy, in which Prometheus expresses the passionate wish that he might impart feeling to his lifeless images, Epimetheus appears as a second representative of the gods. Their offer, he tells Prometheus, is reasonable; let him but recognise their supremacy, and he will be free of the heights of Olympus, from which he would rule the earth. "Yes," is the reply, "to be their burggrave, and defend their Heaven! My offer is more reasonable; their wish is to be a partner with me, and my thought is to have nothing to participate with them; they cannot rob me of what I have, and what they have, let them guard. Here is mine, and here is thine, and so are we apart." "But what is thine?" inquires Epimetheus; and the reply is, "The circle which my activity fulfils--_Der Kreis, den meine Wirklichkeit erfuellt_." And here follows one of the passages in the dialogue which, as expressing the pantheistic conception of the universe, gave occasion to the quarrel of the philosophers, to be presently noted. "Thou standest alone," is the comment of Epimetheus on the claim to independent self-subsistence asserted by Prometheus; "thou standest alone; thy self-will fails to appreciate the bliss of the gods--thou, thine, the world and heaven, all feel themselves one intimate whole." Repelled like Mercury, Epimetheus departs, and Minerva, in whom Prometheus acknowledges his sole inspirer and instructress, appears. Minerva, who declares that she honours her father Zeus and loves Prometheus, repeats the offer of Zeus to animate the clay images if Prometheus will acknowledge his sovereignty; but when Prometheus passionately refuses to accept the offer, she bursts forth: "And they shall live! to fate and not to the gods it pertains to bestow life and to take it. Come, I conduct thee to the source of all life, which Jupiter may not close against us. They shall live, and through thee!"