Mankind, folly and baseness of, v. 10 (l. 9); ix. 2, 3 (l. 13), 29; x. 15, 19. Mankind, ingratitude of, x. 36. Material, the. _See_ Formal. Nature, after products of, iii. 2; vi. 36. Nature, bounds fixed by, v. 1. Nature, man formed by, to bear all that happens to him, v. 18; viii. 46. Nature, nothing evil, which is according to, ii. 17 (sub f.); vi. 33. Nature of the universe. _See_ Universe, nothing that happens is contrary to the nature of the. Nature, perfect beauty of, iii. 2; vi. 36. Nature, we should live according to, iv. 48 (sub. f.), 51; v. 3. 25; vi. 16 (l. 12); vii. 15, 55; viii. 1, 54; x. 33. New, nothing, under the sun, ii. 14 (l. 11); iv. 44; vi. 37, 46; vii. 1, 49; viii. 6; ix. 14; x. 27; xi. 1. Object, we should always act with a view to some, ii. 7, 16 (l. 12); iii. 4; iv. 2; viii. 17; x. 37; xi. 21; xii. 20. Obsolete, all things become, iv. 33. Omissions, sins of, ix. 5. Opinion, iv. 3 (par. 2) (sub f.), 7, 12, 39; vi. 52, 57; vii. 2, 14, 16, 26, 68; viii. 14, 29, 40, 47, 49; ix. 13, 29 (l. 12), 32, 42 (l. 21); x. 3; xi. 16, 18; xii. 22, 25. Others' conduct not to be inquired into, iii. 4; iv. 18; v. 25. Others, opinion of, to be disregarded, viii. 1 (l. 12); x. 8 (l. 12), 11; xi. 13; xii. 4. Others, we should be lenient towards, ii. 13 (sub f.); iii. 11 (sub f.); iv. 3 (l. 16); v. 33 (l. 17); vi. 20, 27; vii. 26, 62, 63, 70; ix. 11, 27; x. 4; xi. 9, 13, 18; xii. 16. Others, we should examine the ruling principles of; iv. 38; ix. 18, 22, 27, 34. Ourselves often to blame for expecting men to act contrary to their nature, ix. 42 (l. 31). Ourselves, reformation should begin with, xi. 29. Ourselves, we should judge, x. 30; xi. 18 (par. 4). Pain, vii. 33, 64; viii. 28. Perfection not to be expected in this world, ix. 29 (l. 7). Perseverance, v. 9; x. 12. Persuasion, to be used, vi. 50. Perturbation, vi. 16 (sub f.); viii. 58; ix. 31. Pessimism, ix. 35. Philosophy, v. 9; vi. 12; ix. 41 (l. 15). Pleasure, he who pursues, is guilty of impiety, ix. 1 (l. 24). Pleasures are enjoyed by the bad, vi. 34; ix. 1 (l. 30). Power, things in our own, v. 5, 10 (sub f.); vi. 32, 41, 52, 58; vii. 2, 14, 54, 68; x. 32, 33. Power, things not in our own, v. 33 (sub f.); vi. 41. Practice is good, even in things which we despair of accomplishing, xii. 6. Praise, worthlessness of, iii. 4 (sub f.); iv. 20: vi. 16, 59; vii. 62; viii. 52, 53; ix. 34. Prayer, the right sort of, v. 7; ix. 40. Present time the only thing a man really possesses, ii. 14; iii. 10; viii. 44; xii. 3 (sub f.) Procrastination, _See_ Life to be made a proper use of, etc. Puppet pulled by strings of desire, ii. 2; iii. 16; vi. 16, 28; vii. 3, 29; xii. 19. Rational soul. _See_ Ruling part. Rational soul, spherical form of the, viii. 41 (sub f.); xi. 12; xii. 3 (and _see_ Ruling part). Reason, all-prevailing, v. 32; vi. 1, 40. Reason and nature identical, vii. 11.