The Principal Doctrines




The Principal Doctrines are forty short sayings by Epicurus. They are meant to serve as a pithy summary of the key elements of Epicurus’ philosophical system. These sayings are but the tip of the iceberg, but they serve as a very useful summary and reminder of Epicurus’ key points. The first four make up the “four-fold cure” or tetrapharmakos, which is the centre of the heart of Epicurus’ philosophy.

The Principal Doctrines survive because they are quoted by the ancient writer Diogenes Laertius in his Lives and Sayings of Eminent Philosophers 10.139 — 154. The below translation is by Brad Inwood and L. P. Gerson on pages 32 – 36 of their book The Epicurus Reader: Selected Writings and Testimonia.

The Principal Doctrines of Epicurus, Translated by Brad Inwood & L. P. Gerson

I. What is blessed and indestructible has no troubles itself, nor does it give trouble to anyone else, so that it is not affected by feelings of anger or gratitude. For all such things are a sign of weakness. [Footnote 1]

II. Death is nothing to us. For what has been dissolved has no sense-experience, and what has no sense-experience is nothing to us.

III. The removal of all feeling of pain is the limit of the magnitude of pleasures. Wherever a pleasurable feeling is present, for as long as it is present, there is neither a feeling of pain nor a feeling of distress, nor both together.

IV. The feeling of pain does not linger continuously in the flesh; rather, the sharpest is present for the shortest time, while what merely exceeds the feeling of pleasure in the flesh lasts only a few days. And diseases which last a long time involve feelings of pleasure which exceed feelings of pain.

V. It is impossible to live pleasantly without living prudently, honourably, and justly and impossible to live prudently, honourably, and justly without living pleasantly. And whoever lacks this cannot live pleasantly.

VI. The natural good of public office and kingship is for the sake of getting confidence from [other] men, [at least] from those from whom one is able to provide this.

VII. Some men want to become famous and respected, believing that this is the way to acquire security against [other] men. Thus if the life of such men is secure, they acquire the natural good; but if it is not secure, they do not have that for the sake of which they strove from the beginning according to what is naturally congenial.

VIII. No pleasure is a bad thing in itself. But the things which produce certain pleasures bring troubles many times greater than the pleasures.

IX. If every pleasure were condensed and were present, both in time and in the whole compound [body and soul] or in the most important parts of our nature, then pleasures would never differ from one another.

X. If the things which produce the pleasures of profligate men dissolved the intellect’s fears about the phenomena of the heavens and about death and pains and, moreover, if they taught us the limit of our desires, then we would not have reason to criticize them, since they would be filled with pleasures from every source and would contain no feeling of pain or distress from any source — and that is what is bad.

XI. If our suspicions about heavenly phenomena and about death did not trouble us at all and were never anything to us, and, moreover, if not knowing the limits of pains and desires did not trouble us, then we would have no need of natural science.

XII. It is impossible for someone ignorant about the nature of the universe but still suspicious about the subjects of the myths to dissolve his feelings of fear about the most important matters. So it is impossible to receive unmixed pleasures without knowing natural science.

XIII. It is useless to obtain security from men while the things above and below the earth and, generally, the things in the unbounded remained as objects of suspicion.

XIV. The purest security is that which comes from a quiet life and withdrawal from the many, although a certain degree of security from other men does come by means of the power to repel [attacks] and by means of prosperity.

XV. Natural wealth is both limited and easy to acquire. But wealth [as defined by] groundless opinions extends without limit.

XVI. Chance has a small impact on the wise man, while reasoning has arranged for, is arranging for, and will arrange for the greatest and most important matters throughout the whole of his life.

XVII. The just life is most free from disturbance, but the unjust life is full of the greatest disturbance.

XVIII. As soon as the feeling of pain produced by want is removed, pleasure in the flesh will not increase but is only varied. But the limit of mental pleasures is produced by a reasoning out of these very pleasures [of the flesh] and of the things related to these, which used to cause the greatest fears in the intellect.

XIX. Unlimited time and limited time contain equal [amounts of] pleasure, if one measures its limits by reasoning.

XX. The flesh took the limits of pleasure to be unlimited, and [only] an unlimited time would have provided it. But the intellect, reasoning out the goal and limit of the flesh and dissolving the fears of eternity, provided us with the perfect way of life and had no further need of unlimited time. But it [the intellect] did not flee pleasure, and even when circumstances caused an exit from life it did not die as though it were lacking any aspect of the best life.

XXI. He who has learned the limits of life knows that it is easy to provide that which removes the feeling of pain owing to want and make one’s whole life perfect. So there’s no need for things which involve struggle.

XXII. One must reason about the real goal and every clear fact, to which we refer mere opinions. If not, everything will be full of indecision and disturbance.

XXIII. If you quarrel with all your sense-perceptions you will have nothing to refer to in judging even those sense-perceptions which you claim are false.

XXIV. If you reject unqualifiedly any sense-perception and do not distinguish the opinion about what awaits confirmation, and what is already present in the sense-perception, and the feelings, and every application of the intellect to presentations, you will also disturb the rest of your sense-perceptions with your pointless opinion; as a result you will reject every criterion. If, on the other hand, in your conceptions formed by opinion, you affirm everything that awaits confirmation as well as what does not, you will not avoid falsehood, so that you will be in the position of maintaining every disputable point in every decision about what is and is not correct.

XXV. If you do not, on every occasion, refer each of your actions to the goal of nature, but instead turn prematurely to some other [criterion] in avoiding or pursuing [things], your actions will not be consistent with your reasoning.

XXVI. The desires which do not bring a feeling of pain when not fulfilled are not necessary; but the desire for them is easy to dispel when they seem to be hard to achieve or to produce harm.

XXVII. Of the things which wisdom provides for the blessedness of one’s whole life, by far the greatest is the possession of friendship.

XXVIII. The same understanding produces confidence about there being nothing terrible which is eternal or [even] long-lasting and has also realized that security amid even these limited [bad things] is most easily achieved through friendship.

XXIX. Of desires, some are natural and necessary, some natural and not necessary, and some neither natural nor necessary but occurring as a result of a groundless opinion. [Footnote 2]

XXX. Among natural desires, those which do not lead to a feeling of pain if not fulfilled and about which there is an intense effort, these are produced by a groundless opinion and they fail to be dissolved not because of their own nature but because of the groundless opinions of mankind.

XXXI.The justice of nature is a pledge of reciprocal usefulness, [i.e.,] neither to harm one another nor be harmed.

XXXII. There was no justice or injustice with respect to all those animals which were unable to make pacts about neither harming one another nor being harmed. Similarly, [there was no justice or injustice] for all those nations which were unable or unwilling to make pacts about neither harming one another nor being harmed.

XXXIII. Justice was not a thing in its own right, but [exists] in mutual dealings in whatever places there [is] a pact about neither harming one another nor being harmed.

XXXIV. Injustice is not a bad thing in its own right, but [only] because of the fear produced by the suspicion that one will not escape the notice of those assigned to punish such actions.

XXXV. It is impossible for someone who secretly does something which men agreed [not to do] in order to avoid harming one another or being harmed to be confident that he will escape detection, even if in current circumstances he escapes detection ten thousand times. For until his death it will be uncertain whether he will continue to escape detection.

XXXVI. In general outline justice is the same for everyone; for it was something useful in mutual associations. But with respect to the peculiarities of a region or of other [relevant] causes, it does not follow that the same thing is just for everyone.

XXXVII. Of actions believed to be just, that whose usefulness in circumstances of mutual associations is supported by the testimony [of experience] has the attribute of serving as just whether it is the same for everyone or not. And if someone passes a law and it does not turn out to be in accord with what is useful in mutual associations, this no longer possesses the nature of justice. And if what is useful in the sense of being just changes, but for a while fits our basic grasp [of justice], nevertheless it was just for that length of time, [at least] for those who do not disturb themselves with empty words but simply look to the facts.

XXXVIII. If objective circumstances have not changed and things believed to be just have been shown in actual practice not to be in accord with our basic grasp [of justice], then those things were not just. And if objective circumstances do change and the same things which had been just turn out to be no longer useful, then those things were just as long as they were useful for mutual associations of fellow citizens; but later, when they were not useful, they were no longer just.

XXXIX. The man who has made the best arrangements for the confidence about external threats is he who has made the manageable things akin to himself, and has at least made the unmanageable things not alien to himself. But he avoided all contact with things for which not even this could be managed and he drove out of his life everything which it profited him to drive out.

XL. All those who had the power to acquire the greatest confidence from [the threats posed by] their neighbours also thereby lived together most pleasantly with the surest guarantee; and since they enjoyed the fullest sense of belonging they did not grieve the early death of the departed, as though it called for pity.



1. Scholiast: “Elsewhere he says that the gods are contemplated by reason, and that some exist ‘numerically’ [i.e., are numerically distinct, each being unique in kind] while others are similar in form, because of a continuous flow of similar images to the same place; and that they are anthropomorphic”.

2. Scholiast: “Epicurus thinks that those which liberate us from pains are natural and necessary, for example drinking in the case of thirst; natural and not necessary are those which merely provide variations of pleasure but do not remove the feeling of pain, for example expensive foods; neither natural nor necessary are, for example, crowns and the erection of statues”.

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