Prayer: _defined_, 68, 69, 76, 78, 85, 102, 1O5, 127, 136, 148; it is an act, 161; not an act of the appetitive powers, 68, 71, 77; it is an act of the virtue of religion, 76-80, 161; after devotion, prayer is the highest act of the virtue of religion, 77; it is a conversation with God, 74; by it we become God's beggars, 110; it is peculiar to the rational creation, 112-114; in what sense the brute creatures pray, 114; prayer is a gift from God, 139; three requisites for prayer, 146; four requisites for prayer, 138; the real meaning of "petition," 78, 79; the prayer of desire, 92, 105; in what sense desire is not prayer, 77, 78; prayer is a real cause, 72, 74, 166 _Why we should pray:_ prayer is reasonable, 71-76, 107, 120, 147; the merit of prayer, 125, 137-143; the effects of prayer, 71, 120, 125, 132, 138; prayer causes union with God, 70, 71 _Errors concerning prayer:_ in general, 72; it is not an adjuring of God, 148; it never wearies God, 79, 80; "much speaking" in prayer, 135; it cannot change God's decrees, 72, 73, 86, 107, 161; it does not "bend" His will, 86; God knows beforehand what we would pray for, 73, 75, 80, 86, 120 _Of prayers heard and unheard:_ the condition necessary if our prayers are to be heard, 89, 96, 141, 144; of prayers heard in anger, 142, 143; in what sense the prayers of sinners are heard, 143-146; the prayers of the poor are speedily heard, 69; how the prayers of the Saints are heard, 162, 168; the prayers of the Martyrs and Apostles, 162, 163; why prayers are not heard, 142; of unheard prayers, 140; why our prayers for others are sometimes not heard, 96; in what sense the prayers of sinners are heard, 143-146 _How we should pray:_ at regular intervals, 134; our attitude in prayer, 150, 151; beginning occupations with prayer, 70; prayer "without ceasing," 91, 137; attention at prayer, 125; three kinds of attention, 120, 133; distractions, 121, 127-133; the length of our prayers, 133-137; hindrances to prayer, 75; the recitation of Psalms, 123; prayer "in spirit and in truth," 126; weariness in prayer, 134 _What we should pray for:_ the impetratory value of prayer, 138, 141; what we should pray for in general, 129, 142; for Beatitude, 85-87; prayer for definite things, 84-88; for "sufficiency of life," 89; against death, 83; for continence, 87; for knowledge of Holy Scripture, 88; for deliverance from toothache, 92, 94; for others, 95, 97, 98, 229; for the wicked, 97; for the good, 98; for our inferiors, 98; for temporal blessings, 89-95; for the predestinate, 167; for our enemies, 99-102; the Saints in Heaven pray for the resurrection of their bodies, 116 _To whom we should pray:_ not to God alone, 80-84; to the Angels, 81; to the Saints, 157-161; to the lesser Saints, 117 _Who pray for us, and how:_ the Angels pray for us, how, 114;