It is the duty of every man to destroy the superstitions of his time, and yet there are thousands of men and women, fathers and mothers, who repudiate with their whole hearts the creeds of superstition, and still allow their children to be taught these lies. They allow their imaginations to be poisoned with the dogma of eternal pain. They allow arrogant and ignorant parsons, meek and foolish teachers, to sow the seeds of barbarism in the minds of their children--seeds that will fill their lives with fear and pain. Nothing can be more important to a human being than to be free and to live without fear. It is far better to be a mortal free man than an immortal slave. Fathers and mothers should do their utmost to make their children free. They should teach them to doubt, to investigate, to inquire, and every father and mother should know that by the cradle of every child, as by the cradle of the infant Hercules, crawls the serpent of superstition. IV. THE SCHEME OF NATURE. AT that time it was pretended by the believers in God that the plan, or the scheme of nature, was not cruel; that the lower was sacrificed for the benefit of the higher; that while life lived upon life, while animals lived upon each other, and while man was the king or sovereign of all, still the higher lived upon the lower. Consequently, a lower life was sacrificed that a higher life might exist. This reasoning satisfied many. Yet there were thousands that could not see why the lower should be sacrificed, or why all joy should be born of pain. But, since the construction of the microscope, since man has been allowed to look toward the infinitely small, as well as toward the infinitely great, he finds that our fathers were mistaken when they laid down the proposition that only the lower life was sacrificed for the sake of the higher. Now we find that the lives of all visible animals are liable to be, and in countless cases are, destroyed by a far lower life; that man himself is destroyed by the microbes, the bacilli, the infinitesimal. We find that for the sake of preserving the yellow fever germs millions and millions have died, and that whole nations have been decimated for the sake of the little beast that gives us the cholera. We have also found that there are animals, call them what you please, that live on the substance of the human heart, others that prefer the lungs, others again so delicate in their palate that they insist on devouring the optic nerve, and when they have destroyed the sight of one eye have sense enough to bore through the cartilage of the nose to attack the other. Thus we find the other side of this proposition. At first sight the lower seemed to be sacrificed for the sake of the higher, but on closer inspection the highest are sacrificed for the sake of the lowest.