4. If each of these lessons had been perfect in themselves the addition made by Christianity, which defined the relations between men, the law of human rights and the doctrines essential to the stability and purity of society, would have enabled mankind to build up satisfactory institutions and a complete civilization from the Roman period. But the elementary lessons were very incomplete. The Asiatics became very superstitious; the Greeks could teach men the _art_ of thinking, or exercising their minds, but they could not find the true starting point; they did not discover what subjects it was useful, and what it was useless, to reason upon; and wasted a good part of the thought of their times on profitless questions. Their failure to obtain a clear and valuable result from philosophy made men skeptical and contributed much to the decline of civilization in the time of the Roman empire. The Romans built their whole structure of law and order on _force_ and a wholesale violation of the rights of mankind, and the minds of men became greatly confused. The doctrine of the Epicurean philosophers—“Let us eat and drink for to-morrow we die”—a despair of working out the problem of life to a satisfactory answer, became the most popular in the empire. The splendor and glory of Oriental, Grecian and Roman civilization seemed to end in degrading servility and superstition, in the endless and absurd speculations of so-called philosophers, and in the vast brutal tyranny of the emperors. The east failed of a pure religion that was generally accepted. Greek philosophy did not have science to guide her thought, and Rome could not be just as well as strong. 5. It was only in modern times that these lessons were made complete. The discoveries in Geography, in Astronomy, in Natural Philosophy, in Chemistry, in Geology, made men acquainted with the structure of the universe, the properties and the laws of matter, and corrected the extravagances of the ancient speculative philosophy. For want of science, Greek thought wandered about in an unreal world and lost a good part of its labor. A long experience under the control of this, corrected thought was required to construct a science of Government that should supply what was wanting to Roman jurisprudence, and Christianity itself could not be rightly understood while so many false theories and wrong practices prevailed.