There are some crimes which, are at the same time frequent in society and yet difficult to prove, as adultery, pederasty, infanticide. A contradiction between the laws and the natural feelings of mankind arises from the oaths which are required of an accused, to the effect that he will be a truthful man when it is his greatest interest to be false; as if a man could really swear to contribute to his own destruction, or as if religion would not be silent with most men when their interest spoke on the other side. The experience of all ages has shown that men have abused religion more than any other of the precious gifts of heaven; and for what reason should criminals respect it, when men esteemed as the wisest have often violated it? Too weak, because too far removed from the senses, are[147] for the mass of people the motives which religion opposes to the tumult of fear and the love of life. The affairs of heaven are conducted by laws absolutely different from those which govern human affairs; so why compromise those by these? Why place men in the terrible dilemma of either sinning against God or concurring in their own ruin? The law, in fact, which enforces such an oath commands a man either to be a bad Christian or to be a martyr. The oath becomes gradually a mere formality, thus destroying the force of religious feelings, which for the majority of men are the only pledge of their honesty. How useless oaths are has been shown by experience, for every judge will bear me out when I say that no oath has ever yet made any criminal speak the truth; and the same thing is shown by reason, which declares all laws to be useless, and consequently injurious, which are opposed to the natural sentiments of man. Such laws incur the same fate as dams placed directly in the main stream of a river: either they are immediately thrown down and overwhelmed, or a whirlpool formed by themselves corrodes and undermines them imperceptibly.