Ignorance, various kinds, 24 sqq.; concomitant, consequent and antecedent, 26, 29; vincible and invincible, 27, 30; influence on voluntariness of acts, 28; effect on sin, 249; sins of ignorance, see Ignorance, Sin of; invincible, in relation to Natural Law, 320; of Christian Law, possibility of, 356; confessors should examine penitents who show signs of ignorance, 924.
Ignorance, Sin of, 250 b, 904 sqq,; culpable ignorance as distinct sin, 907. See also Ignorance.
Images, when obscene, 1456 a.
Immoderation, vice opposed to temperance, 2464 b.
Immorality, see Impurity.
Impatience, vice opposed to patience, 2455 b.
Impediments, simple impediments to reception of Holy Orders, 2784 b; matrimonial impediments, 2804 sqq.
Imperfections, Moral, 185; when they become sin, 186.
Impossibility, Physical, 361 a; moral, 361 b.
Impurity, definition, 2492; sensuality, luxury and curiosity, 2492 n; kinds of impurity, 2493 a; gravity of sin, 2494 a; one of the capital vices, 2494 c; evil fruits of impurity, 2495; when venial and mortal, 2496 a; when directly willed, 2496 b; when indirectly willed, 2496 c; temptations to impurity, 2497; resistance to internal temptations, 2498; what opposition to temptation is sufficient, 2499; insufficient, harmful and unnecessary opposition, 2500; weapons against carnal temptations, 2501; sinfulness of negligence in resisting temptations, 2502; non-consummated sins of impurity, 2504; impure thoughts, 2505; malice of impure thoughts, 2506 a; impure rejoicing, 2507; impure desires, 2508; malice of impure desires, 2509; sins of lewdness, 2510; consummated sins of impurity, 2520; comparative malice of the sins of consummated lust, 2521 a; multiplication of sins of lust, 2522; fornication, 2523; incest, 2532; carnal sacrilege, 2533; unnatural lust, 2534; pollution, 2535; non-sinful pollution, 2536; unimputable pollution, 2537; proximate and remote occasions of pollution, 2538; theological malice of sinful pollution, 2539; moral species of sinful pollution, 2541; canonical penalties for immorality, 2542. See also Lewdness; Fornication.