On Generation and Corruption ( Aristotle), 65 , 66 , 68 â€
On the Gods ( Protagoras), 77
On the Heavens ( Aristotle), 203 , 206 -207
On Holiness ( Epicurus), 245
On Interpretation ( Aristotle), 163 *
"On Leaving Newstead Abbey" ( Byron), 748
On Nature ( Parmenides), 48
On the Nature of Things ( Lucretius), 248 -251
On the Sizes and Distances of the Sun and Moon ( Aristarchus), 214 -215
On the Soul ( Aristotle). See De Anima
One, the, 41 , 48 , 55 , 68 -69, 71 , 129 , 288 , 289 , 290 , 295 , 475
O'Neill, Eugene, American playwright (b. 1888), 21
ontological argument, 154 , 417 -418, 454 , 466 , 585 -588, 693 , 694 , 709
, 760 , 786 787
opinion, 49 , 120 -121, 122 , 125 , 129 , 143 , 146
opposites, 41 , 43 -44, 48 , 63 , 139 , 140 , 257
optics, 561
optimism, 167 , 182 , 286 , 581 , 583 , 722 , 725 , 746 , 759 , 778 , 789 ; of
liberalism, 597 , 598 , 727 , 746 ; philosophies of, 75 , 753 , 759 , 792.
See also cheerfulness; hope
Opus Majus ( Roger Bacon), 464 -465
Opus Minus ( Roger Bacon), 464
Opus Tertium ( Roger Bacon), 464
oracle(s), 42 , 56 , 86 , 88 , 89 , 90 , 477
Orange, Council of, 365
Orange, House of, 559 , 560 , 569
Oresme. Nicole, bishop of Lisieux ( 1330?-1382), 475
Orestes, 12
organic growth, in politics, 511
orgamsm, 165 , 186 , 727 , 731 , 735 , 821 -824, 825
organizations and individuals, 640
organizing activity, 824