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" Defining philosophy as “an activity, attempting by means of discussion and reasoning, to make life happy,” he believed that happiness is gained through the achievement of moral self-sufficiency (autarkeia) and freedom from disturbance (ataraxia). The main obstacles to the goal of tranquillity of mind are our unnecessary fears and desires, and the only way to eliminate these is to study natural science. The most serious disturbances of all are fear of death, including fear of punishment after death, and fear of the gods. Scientific inquiry removes fear of death by showing that the mind and spirit are material and mortal, so that they cannot live on after we die: as Epicurus neatly and logically puts it: “Death…is nothing to us: when we exist, death is not present; and when death is present, we do not exist. Consequently it does not concern either the living or the dead, since for the living it is non-existent and the dead no longer exist” (Letter to Menoeceus 125). As for fear of the gods, that disappears when scientific investigation proves that the world was formed by a fortuitous concourse of atoms, that the gods live outside the world and have no inclination or power to intervene in its affairs, and that irregular phenomena such as lightning, thunder, volcanic eruptions, and earthquakes have natural causes and are not manifestations of divine anger. Every Epicurean would have agreed with Katisha in the Mikado when she sings: But to him who’s scientific There’s nothing that’s terrific In the falling of a flight of thunderbolts! So the study of natural science is the necessary means whereby the ethical end is attained. And that is its only justification: Epicurus is not interested in scientific knowledge for its own sake, as is clear from his statement that “if we were not disturbed by our suspicions concerning celestial phenomena, and by our fear that death concerns us, and also by our failure to understand the limits of pains and desires, we should have no need of natural science” (Principal Doctrines 11). Lucretius’ attitude is precisely the same as his master’s: all the scientific information in his poem is presented with the aim of removing the disturbances, especially fear of death and fear of the gods, that prevent the attainment of tranquillity of mind. It is very important for the reader of On the Nature of Things to bear this in mind all the time, particularly since the content of the work is predominantly scientific and no systematic exposition of Epicurean ethics is provided.25 Epicurus despised philosophers who do not make it their business to improve people’s moral condition: “Vain is the word of a philosopher by whom no human suffering is cured. For just as medicine is of no use if it fails to banish the diseases of the body, so philosophy is of no use if it fails to banish the suffering of the mind” (Usener fr. 221). It is evident that he would have condemned the majority of modern philosophers and scientists. "

― Lucretius , The Way Things Are

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Lucretius quote : Defining philosophy as “an activity, attempting by means of discussion and reasoning, to make life happy,” he believed that happiness is gained through the achievement of moral self-sufficiency (autarkeia) and freedom from disturbance (ataraxia). The main obstacles to the goal of tranquillity of mind are our unnecessary fears and desires, and the only way to eliminate these is to study natural science. The most serious disturbances of all are fear of death, including fear of punishment after death, and fear of the gods. Scientific inquiry removes fear of death by showing that the mind and spirit are material and mortal, so that they cannot live on after we die: as Epicurus neatly and logically puts it: “Death…is nothing to us: when we exist, death is not present; and when death is present, we do not exist. Consequently it does not concern either the living or the dead, since for the living it is non-existent and the dead no longer exist” (Letter to Menoeceus 125). As for fear of the gods, that disappears when scientific investigation proves that the world was formed by a fortuitous concourse of atoms, that the gods live outside the world and have no inclination or power to intervene in its affairs, and that irregular phenomena such as lightning, thunder, volcanic eruptions, and earthquakes have natural causes and are not manifestations of divine anger. Every Epicurean would have agreed with Katisha in the Mikado when she sings: But to him who’s scientific There’s nothing that’s terrific In the falling of a flight of thunderbolts! So the study of natural science is the necessary means whereby the ethical end is attained. And that is its only justification: Epicurus is not interested in scientific knowledge for its own sake, as is clear from his statement that “if we were not disturbed by our suspicions concerning celestial phenomena, and by our fear that death concerns us, and also by our failure to understand the limits of pains and desires, we should have no need of natural science” (Principal Doctrines 11). Lucretius’ attitude is precisely the same as his master’s: all the scientific information in his poem is presented with the aim of removing the disturbances, especially fear of death and fear of the gods, that prevent the attainment of tranquillity of mind. It is very important for the reader of On the Nature of Things to bear this in mind all the time, particularly since the content of the work is predominantly scientific and no systematic exposition of Epicurean ethics is provided.25 Epicurus despised philosophers who do not make it their business to improve people’s moral condition: “Vain is the word of a philosopher by whom no human suffering is cured. For just as medicine is of no use if it fails to banish the diseases of the body, so philosophy is of no use if it fails to banish the suffering of the mind” (Usener fr. 221). It is evident that he would have condemned the majority of modern philosophers and scientists.
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