"It has been commonly observed that blood, wounds, cries and groans, the preparations for painful operations, and everything which directs the senses towards things connected with suffering, are usually the first to make an impression on all men. The idea of destruction, a more complex matter, does not have so great an effect; the thought of death affects us later and less forcibly, for no one knows from his own experience what it is to die; you must have seen corpses to feel the agonies of the dying. But when once this idea is established in the mind, there is no spectacle more dreadful in our eyes, whether because of the idea of complete destruction which it arouses through our senses, or because we know that this moment must come for each one of us and we feel ourselves all the more keenly affected by a situation from which we know there is no escape."