When Plato has provided thus much, he treats his city as already planted and brought to consummation. He thinks himself farther entitled to proclaim it as perfectly good, and therefore as including the four constituent elements of Good: that is, as being wise, brave, temperate, just.[3] He then looks to find wherein each of these four elements resides: wisdom resides specially in the cabinet of Rulers--courage specially in the Guardians--temperance and justice, in these two, but in the producing multitude also. The two last virtues are universal in the Commonwealth. Temperance consists in the harmony of opinion between the multitude and the two higher classes as to obedience: the Guardians are as ready to obey as the Chiefs to command: the multitude are also for the most part ready to obey--but should they ever fail in obedience, the Guardians are prepared to lend their constraining force to the authority of the Chiefs. Having thus settled three out of the four elements of Good, which enumeration he assumes to be exhaustive--Plato assumes that what remains must be Justice. This remainder he declares to be--That each of the three portions of the Commonwealth performs its own work and nothing else: and this is Justice. Justice and Temperance are thus common to all the three portions of the Commonwealth: while Wisdom and Prudence belong entirely to the Chiefs, and Courage entirely to the Guardians. [Footnote 3: Plato, Repub. iv. pp. 427 D-428 A. [Greek: ô|kisme/nê me\n toi/nun, ê)=n d' e)gô/, ê/dê a)/n soi ei)/ê, ô)= pai= A)ri/stônos, ê( po/lis . . . Oi)=mai ê(mi=n tê\n po/lin, ei)/per o)rthô=s ge ô/|kistai, _te/leôs a)gathê\n ei)=nai_. A)na/gkê, e)/phê. Dê=lon dê/, o(/ti sophê/ t' e)sti\ kai\ a)ndrei/a kai\ sô/phrôn kai\ dikai/a. Dê=lon. Ou)kou=n, o(/, ti a)\n au)tô=n eu(/rômen e)n au)tê=|, to\ u(po/loipon e)/stai to\ ou)ch eu(rême/non?] &c.] [Side-note: First mention of these, as an exhaustive classification, in ethical theory. Plato effaces the distinction between Temperance and Justice.]