There are some crimes which are at the same time of common occurrence and of difficult proof. In them the difficulty of proof is equivalent to a probability of innocence; and the harm of their impunity being so much the less to be considered as their frequency depends on principles other than the risk of punishment, the time for inquiry and the period of prescription ought both to be proportionately less. Yet[161] cases of adultery and pederasty, both of difficult proof, are precisely those in which, according to received principles, tyrannical presumptions of quasi-proofs and half-proofs are allowed to prevail (as if a man could be half-innocent or half-guilty, in other words, half-punishable or half-acquittable); in which torture exercises its cruel sway over the person of the accused, over the witnesses, and even over the whole family of an unfortunate wretch, according to the coldly wicked teaching of some doctors of law, who set themselves up as the rule and standard for judges to follow.Whosoever will read with a philosophical eye the codes and annals of different nations will find almost always that the names of virtue and vice, of good citizen and criminal, are changed in the course of ages, not in accordance with the changes that occur in the circumstances of a country, and consequently in conformity with the general interest, but in accordance with the passions and errors that have swayed different legislators in succession. He will observe full often, that the passions of one age form the basis of the morality of later ones; that strong passions, the offspring of fanaticism and enthusiasm, weakened and, so to speak, gnawed away by time (which reduces to a level all physical and moral phenomena) become little by little the prudence of the age, and a useful[204] instrument in the hand of the strong man and the clever. In this way the vaguest notions of honour and virtue have been produced; for they change with the changes of time, which causes names to survive things; as also with the changes of rivers and mountains, which form frequently the boundaries of moral no less than of physical geography.It is not true that the sciences have always been injurious to mankind; when they were so, it was an inevitable evil. The multiplication of the human race over the face of the earth introduced war, the ruder arts, and the first laws, mere temporary agreements which perished with the necessity that gave rise to them. This was mankinds primitive philosophy, the few elements of which were just, because the indolence and slight wisdom of their framers preserved them from error. But with the multiplication of men there went ever a multiplication of their wants. Stronger and more lasting impressions were, therefore, needed, in order to turn them back from repeated lapses to that primitive state of disunion which each return to it rendered worse. Those primitive delusions, therefore, which peopled the earth with false divinities and created an invisible universe that governed our own, conferred a great benefitI mean a great political benefitupon humanity. Those men were benefactors of their kind, who dared to deceive them and drag them, docile and ignorant, to worship at the altars. By presenting to them objects that lay beyond the scope of sense and fled from their grasp the nearer they seemed to approach themnever despised, because never well understoodthey concentrated their divided passions upon a single object[247] of supreme interest to them. These were the first steps of all the nations that formed themselves out of savage tribes; this was the epoch when larger communities were formed, and such was their necessary and perhaps their only bond. I say nothing of that chosen people of God, for whom the most extraordinary miracles and the most signal favours were a substitute for human policy. But as it is the quality of error to fall into infinite subdivisions, so the sciences that grew out of it made of mankind a blind fanatical multitude, which, shut up within a close labyrinth, collides together in such confusion, that some sensitive and philosophical minds have regretted to this day the ancient savage state. That is the first epoch in which the sciences or rather opinions are injurious.[32]From this we see how useful is the art of printing, which makes the public, and not a few individuals, the guardians of the sacred laws, and which has scattered that dark spirit of cabal and intrigue, destined to disappear before knowledge and the sciences, which, however apparently despised, are in reality feared by those that follow in their wake. This is the reason that we see in Europe the diminution of those atrocious crimes that afflicted our ancestors and rendered them by turns tyrants or slaves. Whoever knows the history of two or three centuries ago and of our own, can see that from the lap of luxury and effeminacy have sprung the most pleasing of all human virtues, humanity, charity, and the toleration of human errors; he will know what have been the results of that which is so wrongly called old-fashioned simplicity and honesty. Humanity groaning under implacable superstition; the avarice and ambition of a few dyeing with human blood the golden chests and thrones of[132] kings; secret assassinations and public massacres; every noble a tyrant to the people; the ministers of the Gospel truth polluting with blood hands that every day came in contact with the God of mercythese are not the works of this enlightened age, which some, however, call corrupt.