Our second virtue is courage, which we have no difficulty in finding in another class – that of soldiers. Courage may be defined as a sort of salvation – the never-failing salvation of the opinions which law and education have prescribed concerning dangers. You know the way in which dyers first prepare the white ground and then lay on the dye of purple or of any other colour. Colours dyed in this way become fixed, and no soap or lye will ever wash them out. Now the ground is education, and the laws are the colours; and if the ground is properly laid, neither the soap of pleasure nor the lye of pain or fear will ever wash them out. This power which preserves right opinion about danger I would ask you to call 'courage,' adding the epithet 'political' or 'civilized' in order to distinguish it from mere animal courage and from a higher courage which may hereafter be discussed.
Two virtues remain; temperance and justice. More than the preceding virtues temperance suggests the idea of harmony. Some light is thrown upon the nature of this virtue by the popular description of a man as 'master of himself' – which has an absurd sound, because the master is also the servant. The expression really means that the better principle in a man masters the worse. There are in cities whole classes – women, slaves and the like – who correspond to the worse, and a few only to the better; and in our State the former class are held under control by the latter. Now to which of these classes does temperance belong? 'To both of them.' And our State if any will be the abode of temperance; and we were right in describing this virtue as a harmony which is diffused through the whole, making the dwellers in the city to be of one mind, and attuning the upper and middle and lower classes like the strings of an instrument, whether you suppose them to differ in wisdom, strength or wealth.
And now we are near the spot; let us draw in and surround the cover and watch with all our eyes, lest justice should slip away and escape. Tell me, if you see the thicket move first. 'Nay, I would have you lead.' Well then, offer up a prayer and follow. The way is dark and difficult; but we must push on. I begin to see a track. 'Good news.' Why, Glaucon, our dulness of scent is quite ludicrous! While we are straining our eyes into the distance, justice is tumbling out at our feet. We are as bad as people looking for a thing which they have in their hands. Have you forgotten our old principle of the division of labour, or of every man doing his own business, concerning which we spoke at the foundation of the State – what but this was justice? Is there any other virtue remaining which can compete with wisdom and temperance and courage in the scale of political virtue? For 'every one having his own' is the great object of government; and the great object of trade is that every man should do his own business. Not that there is much harm in a carpenter trying to be a cobbler, or a cobbler transforming himself into a carpenter; but great evil may arise from the cobbler leaving his last and turning into a guardian or legislator, or when a single individual is trainer, warrior, legislator, all in one. And this evil is injustice, or every man doing another's business. I do not say that as yet we are in a condition to arrive at a final conclusion. For the definition which we believe to hold good in states has still to be tested by the individual. Having read the large letters we will now come back to the small. From the two together a brilliant light may be struck out…
Socrates proceeds to discover the nature of justice by a method of residues. Each of the first three virtues corresponds to one of the three parts of the soul and one of the three classes in the State, although the third, temperance, has more of the nature of a harmony than the first two. If there be a fourth virtue, that can only be sought for in the relation of the three parts in the soul or classes in the State to one another. It is obvious and simple, and for that very reason has not been found out. The modern logician will be inclined to object that ideas cannot be separated like chemical substances, but that they run into one another and may be only different aspects or names of the same thing, and such in this instance appears to be the case. For the definition here given of justice is verbally the same as one of the definitions of temperance given by Socrates in the Charmides, which however is only provisional, and is afterwards rejected. And so far from justice remaining over when the other virtues are eliminated, the justice and temperance of the Republic can with difficulty be distinguished. Temperance appears to be the virtue of a part only, and one of three, whereas justice is a universal virtue of the whole soul. Yet on the other hand temperance is also described as a sort of harmony, and in this respect is akin to justice. Justice seems to differ from temperance in degree rather than in kind; whereas temperance is the harmony of discordant elements, justice is the perfect order by which all natures and classes do their own business, the right man in the right place, the division and co-operation of all the citizens. Justice, again, is a more abstract notion than the other virtues, and therefore, from Plato's point of view, the foundation of them, to which they are referred and which in idea precedes them. The proposal to omit temperance is a mere trick of style intended to avoid monotony.
There is a famous question discussed in one of the earlier Dialogues of Plato (Protagoras; Arist. Nic. Ethics), 'Whether the virtues are one or many?' This receives an answer which is to the effect that there are four cardinal virtues (now for the first time brought together in ethical philosophy), and one supreme over the rest, which is not like Aristotle's conception of universal justice, virtue relative to others, but the whole of virtue relative to the parts. To this universal conception of justice or order in the first education and in the moral nature of man, the still more universal conception of the good in the second education and in the sphere of speculative knowledge seems to succeed. Both might be equally described by the terms 'law,' 'order,' 'harmony;' but while the idea of good embraces 'all time and all existence,' the conception of justice is not extended beyond man.
…Socrates is now going to identify the individual and the State. But first he must prove that there are three parts of the individual soul. His argument is as follows: – Quantity makes no difference in quality. The word 'just,' whether applied to the individual or to the State, has the same meaning. And the term 'justice' implied that the same three principles in the State and in the individual were doing their own business. But are they really three or one? The question is difficult, and one which can hardly be solved by the methods which we are now using; but the truer and longer way would take up too much of our time. 'The shorter will satisfy me.' Well then, you would admit that the qualities of states mean the qualities of the individuals who compose them? The Scythians and Thracians are passionate, our own race intellectual, and the Egyptians and Phoenicians covetous, because the individual members of each have such and such a character; the difficulty is to determine whether the several principles are one or three; whether, that is to say, we reason with one part of our nature, desire with another, are angry with another, or whether the whole soul comes into play in each sort of action. This enquiry, however, requires a very exact definition of terms. The same thing in the same relation cannot be affected in two opposite ways. But there is no impossibility in a man standing still, yet moving his arms, or in a top which is fixed on one spot going round upon its axis. There is no necessity to mention all the possible exceptions; let us provisionally assume that opposites cannot do or be or suffer opposites in the same relation. And to the class of opposites belong assent and dissent, desire and avoidance. And one form of desire is thirst and hunger: and here arises a new point – thirst is thirst of drink, hunger is hunger of food; not of warm drink or of a particular kind of food, with the single exception of course that the very fact of our desiring anything implies that it is good. When relative terms have no attributes, their correlatives have no attributes; when they have attributes, their correlatives also have them. For example, the term 'greater' is simply relative to 'less,' and knowledge refers to a subject of knowledge. But on the other hand, a particular knowledge is of a particular subject. Again, every science has a distinct character, which is defined by an object; medicine, for example, is the science of health, although not to be confounded with health. Having cleared our ideas thus far, let us return to the original instance of thirst, which has a definite object – drink. Now the thirsty soul may feel two distinct impulses; the animal one saying 'Drink;' the rational one, which says 'Do not drink.' The two impulses are contradictory; and therefore we may assume that they spring from distinct principles in the soul. But is passion a third principle, or akin to desire? There is a story of a certain Leontius which throws some light