There was something in this philosophy which had the power to inspire a poet of singular genius to expound it in verse. The Roman Lucretius (first century B.C.) regarded Epicurus as the great deliverer of the human race and determined to proclaim the glad tidings of his philosophy in a poem On the Nature of the World. [3] With all the fervour [38] of a religious enthusiast he denounces religion, sounding every note of defiance, loathing, and contempt, and branding in burning words the crimes to which it had urged man on. He rides forth as a leader of the hosts of atheism against the walls of heaven. He explains the scientific arguments as if they were the radiant revelation of a new world; and the rapture of his enthusiasm is a strange accompaniment of a doctrine which aimed at perfect calm. Although the Greek thinkers had done all the work and the Latin poem is a hymn of triumph over prostrate deities, yet in the literature of free thought it must always hold an eminent place by the sincerity of its audacious, defiant spirit. In the history of rationalism its interest would be greater if it had exploded in the midst of an orthodox community. But the educated Romans in the days of Lucretius were sceptical in religious matters, some of them were Epicureans, and we may suspect that not many of those who read it were shocked or influenced by the audacities of the champion of irreligion. The Stoic philosophy made notable contributions to the cause of liberty and could hardly have flourished in an atmosphere where discussion was not free. It asserted the rights of individuals against public [39] authority. Socrates had seen that laws may be unjust and that peoples may go wrong, but he had found no principle for the guidance of society. The Stoics discovered it in the law of nature, prior and superior to all the customs and written laws of peoples, and this doctrine, spreading outside Stoic circles, caught hold of the Roman world and affected Roman legislation. These philosophies have carried us from Greece to Rome. In the later Roman Republic and the early Empire, no restrictions were imposed on opinion, and these philosophies, which made the individual the first consideration, spread widely. Most of the leading men were unbelievers in the official religion of the State, but they considered it valuable for the purpose of keeping the uneducated populace in order. A Greek historian expresses high approval of the Roman policy of cultivating superstition for the benefit of the masses. This was the attitude of Cicero, and the view that a false religion is indispensable as a social machine was general among ancient unbelievers. It is common, in one form or another, to-day; at least, religions are constantly defended on the ground not of truth but of utility. This defence belongs to the statecraft of Machiavelli, who taught that religion is necessary for government,