In the first chapter of this work, borrowing from the English scholar and critic, Mr. Grote, I have given a condensed account of some of the systems of Greek philosophy which began in the first half of the sixth century before Christ, and extended down to Plato, whose life was embraced in 427-347 of the ante-Christian era. About 150 B. C., the Greek philosophy, and especially the speculations of Plato, encountered at Alexandria the monotheism of the Hellenizing Jews.[101] This history of Greek philosophy, as developed by Mr. Grote, shows that the struggle against polytheistic agencies, as the causes of natural phenomena, began with efforts to find purely physical agencies; that this struggle, in spite of the surrounding beliefs in a multitude of supernatural beings of different orders, was long continued, and gave rise to a most remarkable variety of scientific explanations: that it passed through an extraordinary number of physical theories, until at length in Plato there was developed the idea of a distinct personal constructive actor, the Demiurgus, a being to whom, whether intended by Plato as a philosophical myth, or as an entity in which he had something of faith or conviction, he assigned the formation of his Kosmos. With characteristic acumen, the English commentator points out Plato's skill in eluding the possible charge of infidelity to the established religion of Athens, while he at the same time propounded the existence of a personal First Cause that was in a striking degree inconsistent with the popular faith. The whole course of this history of Greek speculation evinces that from an early period the Greek philosophers were utter skeptics in regard to the popular religion and the poetic traditions; that they not only did not derive anything from the primitive religion, from fetichism, from the ghost-beliefs of their barbarian ancestors--if their ancestors had such beliefs--or from their heroic ages, or from the multitudinous gods of the popular theology and the popular worship, or from the old poetical imagery, but that they strove to get away from all these sources, and to construct theories of the universe that would explain the ultimate cause or causes in a very different manner. The earliest Greek speculators got no further in their theories than the construction of systems of physical agencies, or agencies that stood to them in the quality of physical actors. Plato, on the other hand, resorted to the conception of a supreme personal actor.