Catholic Church Documents Council of Nicea Humanae Vitae Ecclesia de Eucharistia Rerum Novarium Council of Trent St Thomas Aquinas – Summa Theologica Redemptionis Sacramentum Familiaris Consortio St. Augustine of Hippo – City of God A Treatise of Novatian Concerning St. Augustine De Trinitas Dei Verbum Gaudium et Spes The Roman Missal Sacrosanctum Concilium Lumen Gentium MEDIATOR DEI