A History of Roman Literature. Harold North Fowler

      So death to us is naught, concerns us not,

      When the soul’s nature is as mortal known.22

      Book iv shows how the impressions made upon our senses are caused by minute images detached from the objects about us. We see, for instance, because minute images of the object seen strike our eyes. Dreams and love are also treated in this book. In Book v the origin of the earth, sun, moon, and stars is described, the beginning of life is explained, and the progress of civilization, from the time when men were savages, is depicted. Some passages in this book anticipate in a measure the modern doctrine of the survival of the fittest. Since our world was not created, but came into being naturally by the combinations of atoms, it will also come to an end at some time by the separation of the atoms. In Book vi various striking phenomena are treated, such as thunder, lightning, earthquakes, tempests, and volcanoes. The book ends with a description of the plague at Athens, derived from the account of Thucydides.

      Ethical doctrine.Since the main purpose of the poem is to free men from religion and the fear of death by showing that all things, including the soul, came into being and are to pass away without any action of the gods, ethical doctrines are not systematically treated. Lucretius accepts, however, the Epicurean dogma that pleasure is the chief good, “the guide of life,”23 but the pleasure he has in mind is not the common physical pleasure, but the calm repose of the philosopher: