Prefiguring science and ethics
Epicurus is a key figure in the development of science and the scientific method because of his insistence that nothing should be believed, except that which was tested through direct observation and logical deduction. Many of his ideas about nature and physics presaged important scientific concepts of our time. He was a key figure in the Axial Age, the period from 800 BCE to 200 BCE, during which similarly revolutionary thinking appeared in China, India, Iran, the Near East, and Ancient Greece. His statement of the Ethic of Reciprocity as the foundation of ethics is the earliest in Ancient Greece, and he differs from the formulation of utilitarianism by John Stuart Mill by emphasizing the minimization of harm to oneself and others as the way to maximize happiness.
Epicurus's teachings represented a departure from the other major Greek thinkers of his period, and before, but was nevertheless founded on many of the same principles as Democritus. Like Democritus, he was an atomist, believing that the fundamental constituents of the world were indivisible little bits of matter (atoms, Greek
atomos, indivisible) flying through empty space (
khaos). Everything that occurs is the result of the atoms colliding, rebounding, and becoming entangled with one another, with no purpose or plan behind their motions. (Compare this with the modern study of particle physics.) His theory differs from the earlier atomism of Democritus because he admits that atoms do not always follow straight lines but their direction of motion may occasionally exhibit a 'swerve' (
clinamen). This allowed him to avoid the determinism implicit in the earlier atomism and to affirm free will. (Compare this with the modern theory of quantum physics, which postulates a non-deterministic random motion of fundamental particles.)
He regularly admitted women and slaves into his school, introducing the new concept of fundamental human egalitarianism into Greek thought, and was one of the first Greeks to break from the god-fearing and god-worshiping tradition common at the time, even while affirming that religious activities are useful as a way to contemplate the gods and to use them as an example of the pleasant life. Epicurus participated in the activities of traditional Greek religion, but taught that one should avoid holding false opinions about the gods. The gods are immortal and blessed and men who ascribe any additional qualities that are alien to immortality and blessedness are, according to Epicurus, impious. The gods do not punish the bad and reward the good as the common man believes. The opinion of the crowd is, Epicurus claims, that the gods "send great evils to the wicked and great blessings to the righteous who model themselves after the gods," when in reality Epicurus believes the gods do not concern themselves at all with human beings.
It is not the man who denies the gods worshipped by the multitude, who is impious, but he who affirms of the gods what the multitude believes about them.
Pleasure as absence of suffering
Epicurus' philosophy is based on the theory that all good and bad derive from the sensations of pleasure and pain. What is good is what is pleasurable, and what is bad is what is painful. Pleasure and pain were ultimately, for Epicurus, the basis for the moral distinction between good and bad. If pain is chosen over pleasure in some cases it is only because it leads to a greater pleasure. Although Epicurus has been commonly misunderstood to advocate the rampant pursuit of pleasure, what he was really after was the absence of pain (both physical and mental, i.e., suffering) - a state of satiation and tranquility that was free of the fear of death and the retribution of the gods. When we do not suffer pain, we are no longer in need of pleasure, and we enter a state of 'perfect mental peace' (
ataraxia).
Epicurus' teachings were introduced into medical philosophy and practice by the Epicurean doctor Asclepiades of Bithynia, who was the first physician who introduced Greek medicine in Rome. Asclepiades introduced the friendly, sympathetic, pleasing and painless treatment of patients. He advocated humane treatment of mental disorders, had insane persons freed from confinement and treated them with natural therapy, such as diet and massages. His teachings are surprisingly modern, therefore Asclepiades is considered to be a pioneer physician in psychotherapy, physical therapy and molecular medicine.
Epicurus explicitly warned against overindulgence because it often leads to pain. For instance, in what might be described as a "hangover" theory, Epicurus warned against pursuing love too ardently. However, having a circle of friends you can trust is one of the most important means for securing a tranquil life.
Epicurus also believed (
contra Aristotle) that death was not to be feared. When a man dies, he does not feel the pain of death because he no longer is and he therefore feels nothing. Therefore, as Epicurus famously said, "death is nothing to us." When we exist death is not, and when death exists we are not. All sensation and consciousness ends with death and therefore in death there is neither pleasure nor pain. The fear of death arises from the false belief that in death there is awareness.
In this context Epicurus said:
Non fui, fui, non sum, non curo (I was not; I have been; I am not; I do not care) — which is inscribed on the gravestones of his followers and seen on many ancient gravestones of the Roman Empire. This quote is often used today at humanist funerals.
The "Epicurean paradox" is a version of the problem of evil. It is a
trilemma argument (God is omnipotent, God is good, but Evil exists); or more commonly seen as this quote:
“Is God willing to prevent evil, but not able?Then he is not omnipotent.Is he able, but not willing?Then he is malevolent.Is he both able and willing?Then whence cometh evil?Is he neither able nor willing?Then why call him God?”
This argument was a type favoured by the ancient Greek skeptics, and may have been wrongly attributed to Epicurus by Lactantius, who, from his Christian perspective, regarded Epicurus as an atheist. According to Reinhold F. Glei, it is settled that the argument of theodicy is from an academic source which is not only not epicurean, but even anti-epicurean. The earliest extant version of this
trilemma appears in the writings of the skeptic Sextus Empiricus.
Epicurus didn’t deny the existence of gods. Instead, he stated that what gods there may be do not concern themselves with us, and thus would not seek to punish us either in this or any other life.
Epicurus emphasized the senses in his epistemology, and his Principle of Multiple Explanations ("if several theories are consistent with the observed data, retain them all") is an early contribution to the philosophy of science.
There are also some things for which it is not enough to state a single cause, but several, of which one, however, is the case. Just as if you were to see the lifeless corpse of a man lying far away, it would be fitting to list all the causes of death in order to make sure that the single cause of this death may be stated. For you would not be able to establish conclusively that he died by the sword or of cold or of illness or perhaps by poison, but we know that there is something of this kind that happened to him.
In contrast to the Stoics, Epicureans showed little interest in participating in the politics of the day, since doing so leads to trouble. He instead advocated seclusion. His garden can be compared to present-day commune. This principle is epitomized by the phrase
lathe bi?sas ???? ?????? (Plutarchus
De latenter vivendo 1128c; Flavius Philostratus
Vita Apollonii 8.28.12), meaning "live secretly", "get through life without drawing attention to yourself", i. e. live without pursuing glory or wealth or power, but anonymously, enjoying little things like food, the company of friends, etc.
As an ethical guideline, Epicurus emphasized minimizing harm and maximizing happiness of oneself and others:
It is impossible to live a pleasant life without living wisely and well and justly (agreeing "neither to harm nor be harmed"), and it is impossible to live wisely and well and justly without living a pleasant life.