Roman Stoicism / being lectures on the history of the Stoic philosophy with special reference to its development within the Roman Empire

by Edward Vernon Arnold

Substance.

182. The analysis of the first two categories, those of Substance and Quality, leads us at once to the profoundest problems of Metaphysics; and even if we allow that the difficulty is primarily grammatical, and resolves itself into a discussion of the functions of Substantive and Adjective, it is none the less inextricably interwoven with all our habits of thought. It would be unreasonable to expect from the Stoics perfectly clear and consistent language on this point; they absorb into their system much from popular philosophy, and much from the teaching of Aristotle in particular. The view which is distinctively Stoic is that Substance and Quality are both body[51], but in two different aspects. The terms ‘body’ and ‘substance’ refer to the same reality, but do not describe it with the same fulness. Yet because the very word ‘substance’ (οὐσία) suggests existence, the Stoics are drawn also to speak of ‘substance without quality’ (ἄποιος οὐσία), and seem to identify it with a dead ‘matter’ (ὕλη), or ‘substratum’ (ὑποκείμενον), as though life must be introduced into it from without[52]. This is practically the view of Aristotle, embodied in the phrase ‘matter without quality is potentially body’[53]; but just so far as terms of this kind imply a dualistic explanation of the universe, they are not really reconcileable with the fundamental principles of Stoicism, and they must therefore be understood with reservations. It may often seem that the three terms ‘body,’ ‘substance,’ ‘matter,’ are practically interchangeable, but they are of different rank. For body exists eternally of itself; whereas substance and matter, except when loosely used as equivalents of body, do not exist of themselves, but substance always in association with quality[54], and matter always in association with force. Further we may distinguish between ‘substance’ in general, or ‘first matter,’ which is a ‘substratum’ (ὑποκείμενον) to the universe, and the ‘matter’ of particular things[55]. The former never grows greater or less, the latter may alter in either direction[56].

Quality.

183. Quality (ποιότης, τὸ ποιόν, qualitas) constitutes the second category. It is defined by the Stoics as a difference in a substance which cannot be detached from that substance, but makes it ‘such and such,’ as for instance ‘sweet,’ ‘round,’ ‘red,’ ‘hot[57].’ Qualities, say the Stoics, are bodies[58]. This paradoxical statement may be understood in two ways; first, in that qualities do not exist independently, but are aspects of ‘body’ which possesses quality; secondly, in that qualities are bodies in a secondary sense. We may consider it evidence of the second point of view that language describes the qualities by nouns, as ‘sweetness,’ ‘rotundity,’ ‘redness,’ ‘heat’; and indeed it is not so long since our own chemists described heat as a ‘substance’ under the name of ‘caloric.’ This point of view is carried to an extreme when the Stoics say ‘qualities are substances,’ thus throwing the first two categories into one[59]. Much stronger is the tendency towards Aristotle’s views, so that as substance becomes identified with dead matter, quality is explained as the movement, tension, or current which endows it with life. Hence the Stoics say ‘the movement of rarefaction is the cause of quality[60]’; ‘matter is a dull substratum, qualities are spirits and air-like tensions[61]’; ‘quality is a spirit in a certain disposition[62]’; ‘the air-current which keeps each thing together is the cause of its quality[63].’ All these expressions must however be interpreted in the light of the Stoic theory as a whole. Finally we notice that, corresponding to the two kinds of substance, general and particular, there are two kinds of quality, as shewn in the ‘generically qualified’ (κοινῶς ποιόν) and the ‘individually qualified’ (ἰδίως ποιόν); for instance, heat in the universe and heat in particular objects[64].

Disposition.

184. The third category is that of ‘disposition’ (πὼς ἔχοντα, res quodammodo se habens). It differs from quality in its variableness; for a brave man is always brave, and fire is always hot; but a man is sometimes standing, sometimes lying; fire is sometimes lambent, sometimes still. Qualities therefore appear to correspond generally to the συμβεβηκότα (coniuncta) of Epicurus, in that they can never be separated from a body[65]; and dispositions rather with the συμπτώματα (eventa), which come and go[66]. The third category appears to be used by the Stoics in a very wide sense, and to correspond to several of the categories of Aristotle[67]. Disposition is attached to quality as quality is attached to substance[68]; and though dispositions are not expressly termed bodies, yet we must consider them to be, as the terms in the Greek and Latin sufficiently indicate, bodies in particular aspects.

In the further applications of Stoic theory disposition as defined above appears to be replaced in Greek by the term ἕξις. But this term is used in two different senses. In the first place it is the movement of rarefaction and condensation, by which a spirit or thrill passes from the centre of an object to the extremities, and returns from the extremities to the centre[69]; in this sense it is translated in Latin by unitas, and takes bodily form as an air-current[70]. This force, when it requires a further motive power in the direction of development, becomes the principle of growth (φύσις, natura), and is displayed not only in the vegetable world, but also in animals, as in particular in the hair and nails[71]. Growth when it takes to itself the further powers of sensation and impulse becomes soul (ψυχή, anima), and is the distinctive mark of the animal world[72].

In a rather different sense ἕξις or temporary condition is contrasted with διάθεσις or ‘permanent disposition.’ In this sense the virtues are permanent dispositions of the soul, because virtue is unchanging; the arts are temporary conditions. The virtues belong to the wise man only, the arts to the ordinary man. This distinction however does not hold its ground in the Roman period, the word habitus (representing ἕξις), our ‘habit,’ being used in both senses[73]. The virtues are bodies, being dispositions of the soul which is bodily[74].

Relative position.

185. The fourth category, that of ‘relative position’ (πρός τί πως ἔχον) appears to be of less importance than the others[75]. Its characteristic is that it may disappear without altering that to which it belongs. Thus that which is on the right hand may cease to be so by the disappearance of that which was on its left; a father may cease to be such on the death of his son[76]. It seems difficult to describe the fourth category as one consisting of ‘body,’ but at least it is a function of body. Also it does not appear that ‘relative position’ can be predicated of the universe as a whole; it is peculiar to individual objects, but works towards their combination in a larger whole. The fourth category has an important application in practical ethics in the doctrine of daily duties, for these are largely determined by the relative positions (σχέσεις) of the parties concerned: such are the duties of a king to his people, a father to his son, a slave to his master[77].