O.
[Objective], and subjective views of ethics, Sokrates distinguished, i. [451];
dissent coincident with subjective unanimity, [ ib.];
see [Relativity. ]
[Observation], astronomy must not be studied by, iv. [73];
nor acoustics, [74].
[Obstetric], of Sokrates, i. [367], ii. [251], iii. [112], [176].
[Odysseus], ii. [56].
[Oken], Pythagoreanism, i. [10 n.]
[Oligarchy], iv. [79];
Plato’s second state a compromise of democracy and, [333], [337].
Ὁμώνυμα, first distinguished from συνώνυμα by Aristotle, iii. [94 n.]
Ὁμωνύμως, ii. [193].
[One], in the Many, and Many in the One, aim of philosophy, i. [407];
difficulties about many and, iii. [339];
see [Idea].
[Ontology] and physics, radically distinct points of view, i. [23 n.];
the science of Ens, first appears in the Eleates, [22];
reconciliation of physics with, attempted unsuccessfully after Parmenides, [23 n.];
Plato blends ethics with, iii. [306];
Aristotle’s substratum for phenomenology, i. [24 n.];
tendency to embrace logical phantoms as real causes, ii. [404 n.];
see [Ens], [Philosophy].
[Opinion,] public, see [Authority].
[Opinion], Xenophanes’ doctrine, i. [18];
Parmenides’, [20];
Demokritus’, [72];
embraces all varieties of knowledge save of the Good, ii. [30];
right, of good statesmen, derived from inspiration, [242];
compared with knowledge, [241], [253], [255 n.], iii. [167 n.], [181 n.];
antithesis less marked in Theætêtus than Politikus, [257];
Plato’s compared with modern views, ii. [254];
the mind rises from sensation to opinion, then cognition, iii. [164];
distinct from sensation, [166];
true, knowledge is, [168];
verification from experience, not recognised as necessary or possible, [ib.];
if false, possible, [169], [181 n.], [351];
waxen memorial tablet in the mind, [169];
false, is the confusion of cognitions and non-cognitions, refuted, [171];
wherein different from knowledge, [172];
true, not knowledge, communicated by rhetor, [ib.];
true, plus rational explanation, is knowledge, [173];
analogy of elements and compounds, [ib.];
rejected, [174];
intercommunion of forms of non-ens and of proposition, opinion, judgment, [213], [214];
akin to proposition, and may be false, by partnership with form non-ens, [214];
relation to kosmical soul, iv. [227];
its matter, what is between ens and non-ens, [49];
two grades of, Faith or Belief, and Conjecture, [67];
true pleasure attached to true, iii. [351].
[Opposites], only one to each thing, ii. [13 n.]
[Optimism], ii. [ 393-6].
[Orphic] canon of life, iii. [390 n.], iv. [15];
coincidence of Timæus with, [255 n.]
[Orthodoxy], local infallibility claimed, but rarely severely enforced in Greece, iv. [396];
less intolerance at Athens than elsewhere, iii. [277], iv. [126];
Sophists conform to prevalent, [56];
irresistible effect of public opinion in producing, i. [392], iv. [55];
common sense of a community, its propagation, ii. [274];
Plato on, i. [xi], [342], [392 n.], [424], iv. [69 n.], [165];
probable feelings of Plato, ii. [367];
Sokrates in Phædon contrasted with Apology, [421];
inconsistently exacted in Plato’s state, iii. [ 277-8], iv. [24], [156], [160], [327], [379], [430];
three varieties of heresy, [376];
proëm to laws against, [383];
first confuted, [386];
argument inconsistent and unsatisfactory, [388];
second confuted, [389];
contradicts Republic, [390];
the third the worst, [384];
confuted, [391];
general Greek belief, [381], [391], [394];
incongruity of Plato’s doctrine, [393];
opposition to Plato’s doctrine in Greece, [395];
Cicero, [379 n.];
Milton, [ib.];
Bp. Butler, [166 n.];
book-burning, [379 n.];
see [Authority].
Οὐσία, must be known before πάθη, ii. [243 n.]