Goldsmith said there are two classes of people who dread ridicule--priests and fools. They cry out that it is no argument, but they know it is. It has been found the most potent form of argument. Euclid used it in his immortal Geometry; for what else is the _reductio ad absurdum_ which he sometimes employs? Elijah used it against the priests of Baal. The Christian fathers found it effective against the Pagan superstitions, and in turn it was adopted as the best weapon of attack on _them_ by Lucian and Celsus. Ridicule has been used by Bruno, Erasmus, Luther, Rabelais, Swift, and Voltaire, by nearly all the great emancipators of the human mind. All these men used it for a serious purpose. They were not comedians who amused the public for pence. They wielded ridicule as a keen rapier, more swift and fatal than the heaviest battle-axe. Terrible as was the levin-brand of their denunciation, it was less dreaded than the Greek fire of their sarcasm. I repeat that they were men of serious aims, and indeed how could they have been otherwise? All true and lasting wit is founded on a basis of seriousness; or else, as Heine said, it is nothing but a sneeze of the reason. Hood felt the same thing when he proposed for his epitaph: "Here lies one who made more puns, and spat more blood, than any other man of his time." Buckle well says, in his fine vindication of Voltaire, that he "used ridicule, not as the test of truth, but as the scourge of folly." And he adds-- "His irony, his wit, his pungent and telling sarcasms, produced more effect than the gravest arguments could have done; and there can be no doubt that he was fully justified in using those great resources with which nature had endowed him, since by their aid he advanced the interests of truth, and relieved men from some of their most inveterate prejudices." Victor Hugo puts it much better in his grandiose way, when he says of Voltaire that "he was irony incarnate for the salvation of mankind." Voltaire's opponents, as Buckle points out, had a foolish reverence for antiquity, and they were impervious to reason. To compare great things with small, our opponents are of the same character. Grave argument is lost upon them; it runs off them like water from a duck. When we approach the mysteries of their faith in a spirit of reverence, we yield them half the battle. We must concede them nothing. What they call reverence is only conventional prejudice. It must be stripped away from the subject, and if argument will not remove the veil, ridicule will. Away with the insane notion that absurdity is reverend because it is ancient! If it is thousands of years old, treat it exactly as if it were told the first time to-day. Science recognises nothing in space and time to invalidate the laws of nature. They prevailed in the past as well as in the present, in Jerusalem as well as in London. That is how Science regards everything; and at bottom Science and common-sense are one and the same.