Soul, Polis, Philosopher-King

Like any analogy, Plato's concept of the relation between personal Soul and Polis as writ small-writ large suggests a parallel, and, hence, an inherent non-coincidence of the two terms.  As such, the essential segregation of Soul and Polis seems at home in a Theology of the Salvation of the Individual Soul, expostulated in a work entitled City of God.  However, in the Republic, Plato proceeds to violate the parallel. For, rather, Soul and Polis converge--in the person of the Philosopher-King, a Just person under whose Rational rulership the Polis becomes Just.  Likewise, Aristotle's concept of the Just person is part of the education of Political leadership.  The lacuna in Plato's concept of a Just Polis is that it does not explain how the Souls of the ruled become Just, since they, unlike that of the Philosopher-King, are inherently Unjust, i. e. not ruled by Reason.  Regardless, the Republic is a City of Man, not a City of God, as its corporeal necessities indicate.