Volume — Koch–PreussVolume IV: Man's Duties to GodContentsTitle Pages (Volume IV)Contents (as printed)Part I: The Duty of Internal WorshipChapter I: FaithSection 1: Nature and Necessity of FaithSection 2: Duty and Extent of FaithSection 3: Qualities and Fruits of FaithSection 4: Sins Against FaithChapter II: HopeSection 1: Nature, Object, and Necessity of HopeSection 2: Qualities and Fruits of HopeSection 3: Sins Against HopeChapter III: CharitySection 1: Nature, Motive, and Object of CharitySection 2: Necessity of CharitySection 3: Fruits and Effects of CharitySection 4: Sins Against CharityChapter I: The Nature, Efficacy, and Object of PrayerChapter II: The Necessity of Prayer and the Duty of PrayingChapter III: The Qualities of PrayerChapter IV: Kinds of PrayerChapter V: Various Forms of PrayerChapter VI: The Sins Opposed to PrayerPart II: The Duty of External WorshipChapter I: SacrificeChapter II: VowsSection 1: Definition of a VowSection 2: Division of VowsSection 3: Object of VowsSection 4: Conditions of ValiditySection 5: The Obligation of VowsSection 6: Cessation of VowsChapter III: SacrilegeChapter IV: SimonyChapter V: OathsSection 1: Definition and Division of OathsSection 2: Lawfulness of OathsSection 3: Conditions of Validity and LicitnessSection 4: Sins Committed in Connection with OathsChapter VI: SuperstitionSection 1: Nature of SuperstitionSection 2: Superstition in the Natural OrderSection 3: Superstition in the Preternatural OrderSection 4: Superstition in the Supernatural OrderPart III: The Commandments of the ChurchChapter I: Object, History, Number, and Obligation of the Commandments of the ChurchChapter II: The Observance of Sundays and Holydays of ObligationChapter III: The Law of Fasting and AbstinenceSection 1: Definition and Significance of FastingSection 2: The Subject-Matter of the Ecclesiastical FastArticle 1: Days of Fasting and AbstinenceArticle 2: In What Fasting and Abstinence ConsistsSection 3: Obligation of the Law of Fasting and AbstinenceChapter IV: The Precept of Annual Confession and CommunionSection 1: The Annual ConfessionSection 2: The Easter CommunionChapter V: The Precept of Contributing to the Support of Church and PastorChapter VI: The Law of the Church Concerning BooksSection 1: The Preventive Censorship of BooksSection 2: The Prohibition of BooksSection 3: The Index of Forbidden BooksIndex (Volume IV)