Chapter V.
Now of the Particular Justice, and the Just involved in it, one species is that which is concerned in the distributions of honour, or wealth, or such other things as are to be shared among the members of the social community (because in these one man as compared with another may have either an equal or an unequal share), and the other is that which is Corrective in the various transactions between man and man.
And of this latter there are two parts: because of transactions some are voluntary and some involuntary; voluntary, such as follow; selling, buying, use, bail, borrowing, deposit, hiring: and this class is called voluntary because the origination of these transactions is voluntary.
The involuntary again are either such as effect secrecy; as theft, adultery, poisoning, pimping, kidnapping of slaves, assassination, false witness; or accompanied with open violence; as insult, bonds, death, plundering, maiming, foul language, slanderous abuse.
Chapter VI.
Well, the unjust man we have said is unequal, and the abstract “Unjust” unequal: further, it is plain that there is some mean of the unequal, that is to say, the equal or exact half (because in whatever action there is the greater and the less there is also the equal, i.e. the exact half). If then the Unjust is unequal the Just is equal, which all must allow without further proof: and as the equal is a mean the Just must be also a mean. Now the equal implies two terms at least: it follows then that the Just is both a mean and equal, and these to certain persons; and, in so far as it is a mean, between certain things (that is, the greater and the less), and, so far as it is equal, between two, and in so far as it is just it is so to certain persons. The Just then must imply four terms at least, for those102 to which it is just are two, and the terms representing the things are two.