Ideals, created by reflection, [431], [433-34]; devotion to, [169], [170], [173]; foundation of, [276]; realization of in art, [331], [337]; in morals, [437]; in religion, [292-93].
Ideas, expressed in art, [351-57]; fear of the novel in, [127], [143], [145]; man alone reacts to, [13].
Imagination, as form of mental activity, [72-77]; in art, [73], [338]; in science, [73-75], [339-41], [375]. See also Creative activity.
Impotence. See Need.
Impulses. See Instincts.
Individual, and education, [186-87], [209-13]; differences (see Differences, individual); maladjustment between environment and, [25].
Individualism, [183-84], [427].
Individuality, and progress, [144-47], [190]; consciousness of unique in man, [13]; in opinion and belief, [142-44].
Induction, [62].
Industry, art as an, [360-61]; individual differences in, [211-12]; need of creative activity in, [72], [339].