… corresponding to the four subsections of our line: Understanding [noe ̄sin] for the highest, thought [dianoian] for the second, belief [pistin] for the third and imagining [eikasian] for the last. Arrange them in a ratio [ana logon] and consider that each shares in clarity to the degree that the subsection it is set over shares in truth.
15. Analogies, Parables, Paradoxes
Get On Down: Plato’s Rhetoric of Education in the Republic
by Kathy Eden
in A Companion to Rhetoric and Rhetorical Criticism
edited by Walter Jost, Wendy Olmsted
The Republic
Book VI
Socrates – Glaucon
by Plato
translated by Benjamin Jowett
http://classics.mit.edu/Plato/republic.7.vi.html
You have quite conceived my meaning, I said; and now, corresponding to these four divisions, let there be four faculties in the soul-reason answering to the highest, understanding to the second, faith (or conviction) to the third, and perception of shadows to the last-and let there be a scale of them, and let us suppose that the several faculties have clearness in the same degree that their objects have truth.
Plato #6 — Knowledge vs. Opinion (Republic 5–7)
by Tobias Hoffmann
http://faculty.cua.edu/hoffmann/courses/201_1068/Plato-6%20knowledge%20and%20opinion.pdf