Epicurus' Theory of Soul:
Epicurus is an atomist, and in accordance with his atomism he takes the soul, like everything else that there is except for the void, to be ultimately composed of atoms. Our sources are somewhat unclear as to exactly which kinds of materials he took to be involved in the composition of soul. It is very probable, though, that in addition to some relatively familiar materials — such as fire-like and wind-like stuffs, or rather the atoms making up such stuffs — the soul, on Epicurus' view, also includes, in fact as a key ingredient, atoms of a nameless kind of substance, which is responsible for sense-perception. Thus it seems that while he thought he could explain phenomena such as the heat or warmth of a living organism, as well as its movement and rest, by appealing to relatively familiar materials and their relatively familiar properties, he did feel the need to introduce a mysterious additional kind of substance so as to be able to explain sense-perception, apparently on the grounds that “sense-perception is found in none of the named elements” (L&S 14C). It is worth noting that it is specifically with regard to sense-perception that Epicurus thinks the introduction of a further, nameless kind of substance is called for, rather than, for instance, with regard to intellectual cognition. What this suggests, and what in fact we have independent reason to think, is that on Epicurus' view, once one is in a position adequately to explain sense-perception, one will then also be in a position to work out an explanation of intellectual cognition, by appropriately extending the explanation of sense-perception. Let us consider briefly how such extension might work.
Perceptual beliefs, like the belief that ‘there is a horse over there’, will be explained, in Epicurus' theory, in terms of sense-impressions and the application of concepts (‘preconceptions’; for discussion cf. Asmis 1999, 276-83), and concept-formation is in turn explained in terms of sense-impression and memory. According to Diogenes Laertius' summary (L&S 17E1-2), the Epicureans say that
preconception is, as it were, cognition or correct belief or conception or universal ‘stored notion’ (i.e. memory), of that which has frequently become evident externally: e.g. ‘such-and-such a kind of thing is a man’. For as soon as the word ‘man’ is uttered, immediately its impression also comes to mind by means of preconception, as a result of antecedent sense-perceptions.
Moreover, sense-impressions, interpreted and articulated in terms of concepts or preconceptions, yield experience concerning evident matters, which in turn forms the basis for conclusions about non-evident matters. For example, extensive experience can make clear to one not only that the human beings one has interacted with have a certain feature (say, rationality), but also (later Epicureans will say, probably somewhat developing Epicurus' position) that it is inconceivable that any human being could fail to have that feature (cf. L&S 18F4-5). And so, experience will not only make one expect, with a very great deal of confidence, that any human being one will ever encounter anywhere will be rational. Experience also, according to the Epicureans, supports the inference to, and hence justifies one in accepting, the (non-evident) conclusion that all human beings, everywhere and at all times, are rational (for detailed discussion, cf. Allen 2001, 194-241). This obviously is an extremely generous view of what experience, and ultimately sense-perception, can do! Once we recognize the enormously powerful and fundamental role Epicurus and his followers assign to sense-perception, we will not be surprised to see that they feel the need to include in the composition of the soul a very special kind of material that accounts specifically for sense-perception, but apparently do not think that, in addition to that, some further special material is needed to enable intellectual or rational activity.
In the Epicurean tradition the word ‘soul’ is sometimes used in the broad traditional way, as what animates living things (e.g., Diogenes of Oenoanda, fr. 37 Smith), but the focus of interest, so far as the soul is concerned, is very much on the mental functions of cognition, emotion and desire. A view that is common in the tradition and that very probably goes back to the founder is that the soul is a composite of two parts, one rational, the other nonrational. The rational part, which Lucretius calls mind [animus], is the origin of emotion and impulse, and it is also where (no doubt among other operations) concepts are applied and beliefs formed, and where evidence is assessed and inferences are made. The nonrational part of the soul, which in Lucretius is somewhat confusingly called soul [anima], is responsible for receiving sense-impressions, all of which are true according to Epicurus. Error arises at a later stage, when sense-impressions are interpreted by the rational part of the soul, in a way that, as we have seen, crucially involves memory. Sense-perception, conceived of simply as the reception of sense-impressions by the nonrational soul, does not involve memory (cf. L&S 16B1). Since the formation and application of concepts requires memory, sense-perception, so conceived of, does not involve conceptualization, either. The nonrational part is also responsible for transmitting impulses originating from the rational part, as well as (presumably) for a wide variety of other vital functions. (When Epicurus distinguishes between pleasures and pains of the soul and those of the body, incidentally, the distinction he has in mind must be between the rational part of the soul on the one hand and the body animated by nonrational soul, on the other.)
Epicurus is an atomist, and in accordance with his atomism he takes the soul, like everything else that there is except for the void, to be ultimately composed of atoms. Our sources are somewhat unclear as to exactly which kinds of materials he took to be involved in the composition of soul. It is very probable, though, that in addition to some relatively familiar materials — such as fire-like and wind-like stuffs, or rather the atoms making up such stuffs — the soul, on Epicurus' view, also includes, in fact as a key ingredient, atoms of a nameless kind of substance, which is responsible for sense-perception. Thus it seems that while he thought he could explain phenomena such as the heat or warmth of a living organism, as well as its movement and rest, by appealing to relatively familiar materials and their relatively familiar properties, he did feel the need to introduce a mysterious additional kind of substance so as to be able to explain sense-perception, apparently on the grounds that “sense-perception is found in none of the named elements” (L&S 14C). It is worth noting that it is specifically with regard to sense-perception that Epicurus thinks the introduction of a further, nameless kind of substance is called for, rather than, for instance, with regard to intellectual cognition. What this suggests, and what in fact we have independent reason to think, is that on Epicurus' view, once one is in a position adequately to explain sense-perception, one will then also be in a position to work out an explanation of intellectual cognition, by appropriately extending the explanation of sense-perception. Let us consider briefly how such extension might work.
Perceptual beliefs, like the belief that ‘there is a horse over there’, will be explained, in Epicurus' theory, in terms of sense-impressions and the application of concepts (‘preconceptions’; for discussion cf. Asmis 1999, 276-83), and concept-formation is in turn explained in terms of sense-impression and memory. According to Diogenes Laertius' summary (L&S 17E1-2), the Epicureans say that
preconception is, as it were, cognition or correct belief or conception or universal ‘stored notion’ (i.e. memory), of that which has frequently become evident externally: e.g. ‘such-and-such a kind of thing is a man’. For as soon as the word ‘man’ is uttered, immediately its impression also comes to mind by means of preconception, as a result of antecedent sense-perceptions.
Moreover, sense-impressions, interpreted and articulated in terms of concepts or preconceptions, yield experience concerning evident matters, which in turn forms the basis for conclusions about non-evident matters. For example, extensive experience can make clear to one not only that the human beings one has interacted with have a certain feature (say, rationality), but also (later Epicureans will say, probably somewhat developing Epicurus' position) that it is inconceivable that any human being could fail to have that feature (cf. L&S 18F4-5). And so, experience will not only make one expect, with a very great deal of confidence, that any human being one will ever encounter anywhere will be rational. Experience also, according to the Epicureans, supports the inference to, and hence justifies one in accepting, the (non-evident) conclusion that all human beings, everywhere and at all times, are rational (for detailed discussion, cf. Allen 2001, 194-241). This obviously is an extremely generous view of what experience, and ultimately sense-perception, can do! Once we recognize the enormously powerful and fundamental role Epicurus and his followers assign to sense-perception, we will not be surprised to see that they feel the need to include in the composition of the soul a very special kind of material that accounts specifically for sense-perception, but apparently do not think that, in addition to that, some further special material is needed to enable intellectual or rational activity.
In the Epicurean tradition the word ‘soul’ is sometimes used in the broad traditional way, as what animates living things (e.g., Diogenes of Oenoanda, fr. 37 Smith), but the focus of interest, so far as the soul is concerned, is very much on the mental functions of cognition, emotion and desire. A view that is common in the tradition and that very probably goes back to the founder is that the soul is a composite of two parts, one rational, the other nonrational. The rational part, which Lucretius calls mind [animus], is the origin of emotion and impulse, and it is also where (no doubt among other operations) concepts are applied and beliefs formed, and where evidence is assessed and inferences are made. The nonrational part of the soul, which in Lucretius is somewhat confusingly called soul [anima], is responsible for receiving sense-impressions, all of which are true according to Epicurus. Error arises at a later stage, when sense-impressions are interpreted by the rational part of the soul, in a way that, as we have seen, crucially involves memory. Sense-perception, conceived of simply as the reception of sense-impressions by the nonrational soul, does not involve memory (cf. L&S 16B1). Since the formation and application of concepts requires memory, sense-perception, so conceived of, does not involve conceptualization, either. The nonrational part is also responsible for transmitting impulses originating from the rational part, as well as (presumably) for a wide variety of other vital functions. (When Epicurus distinguishes between pleasures and pains of the soul and those of the body, incidentally, the distinction he has in mind must be between the rational part of the soul on the one hand and the body animated by nonrational soul, on the other.)
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