[Side-note: Two distinct grades of Cognition--Direct or Superior--Noûs--Indirect or Inferior--Dianoia.] The distinction here indicated between the two different sections of the Intelligible Region, and the two different sections of the Region of Sense--we shall mark (continues Sokrates) by appropriate terms. The Dialectician alone has Noûs or Intellect, direct or the highest cognition: he alone grasps and comprehends directly the pure intelligible essence or absolute Form. The Geometer does not ascend to this direct contemplation or intuition of the Form: he knows it only through the medium of particular assumptions, by indirect Cognition or Dianoia; which is a lower faculty than Noûs or Intellect, yet nevertheless higher than Opinion. [Side-note: Two distinct grades of Opinion also in the Sensible World--Faith or Belief--Conjecture.] As we assign two distinct grades of Cognition to the Intelligible Region, so we also assign two distinct grades of Opinion to the Region of Sense, and its two sections. To the first of these two sections, or to real objects of sense, we assign the highest grade of Opinion, _viz._: Faith or Belief. To the second of the two, or to the images of real objects of sense, we assign the lower grade, _viz._: Conjecture. Here then are the four grades. Two grades of Cognition--1. Noûs, or Direct Cognition. 2. Dianoia, or Indirect Cognition: both of them belonging to the Intelligible Region, and both of them higher than Opinion. Next follow the two grades of Opinion. 3. The higher grade, Faith or Belief. 4. The lower grade, Conjecture. Both the two last belong to the sensible world; the first to real objects, the last to images of those objects.[207] [Footnote 207: Plato, Republic, p. 511 D-E.] [Side-note: Distinction between the philosopher and the unphilosophical public, illustrated by the simile of the Cave, and the captives imprisoned therein.]