Doctrinal
Defines as dogma that the souls of the just enjoy the beatific vision immediately after death (or after purgation), and that the damned descend to hell immediately — settling the controversy over the interim state of souls before the General Judgement.
Defines the Catholic doctrine on God the Creator, on divine revelation, on faith and reason, and on the relationship between faith and science — establishing the dogmatic foundations that all subsequent theology presupposes.
Identifies and condemns Modernism as a systematic heresy that reduces dogma to evolving human experience, undermining the foundations of Catholic faith.
Addresses contemporary errors concerning evolution, polygenism, the nature of dogmatic development, and the relationship between philosophy and theology — reaffirming the permanent validity of Thomistic method.
Commemorates the 1500th anniversary of the Council of Chalcedon, reaffirming the two-natures Christology against contemporary theological reductions and the errors of monophysitism.
Grounds devotion to the Sacred Heart in the hypostatic union and the theology of Christ's threefold love — divine, spiritual, and sensible — connecting Christology to the spiritual life.
Moral Theology
Reaffirms the sanctity and indissolubility of Christian marriage, condemns contraception, sterilisation, and eugenics, and establishes the doctrinal framework that Humanae Vitae later presupposes.
Reaffirms the Church's constant teaching that every act of marital intercourse must remain open to the transmission of life, prohibiting artificial contraception.
Provides the philosophical and theological foundations for Catholic moral theology — defending intrinsically evil acts, the objectivity of the moral law, and the inseparability of freedom and truth against proportionalism and consequentialism.
Ecclesiology
Defines the dogma of papal primacy of jurisdiction over the universal Church and papal infallibility when the Pope speaks ex cathedra on matters of faith and morals.
Defines the Church as the Mystical Body of Christ — a visible, hierarchical society animated by the Holy Spirit and governed by the Pope as Vicar of Christ.
The dogmatic constitution on the Church — treating the Church as mystery, as People of God, the hierarchical constitution, the laity, the universal call to holiness, religious life, eschatology, and the Blessed Virgin Mary.
Social Teaching
The founding document of Catholic social teaching — addressing the condition of workers, the right to private property, the just wage, and the proper roles of the state, the Church, and voluntary associations.
Develops Leo XIII's social teaching forty years on — introducing the principle of subsidiarity, critiquing both unrestrained capitalism and socialism, and proposing a reconstruction of the social order.
Faith & Reason
Restores the philosophy and theology of St Thomas Aquinas as the Church's authoritative intellectual method — inaugurating the Thomistic revival within which Pohle, Tanquerey, and the entire modern manual tradition write.
The most developed magisterial treatment of the relationship between philosophy and theology — defending reason's capacity to reach truth, diagnosing modern philosophical errors, and affirming the permanent validity of metaphysics.
Scripture & Tradition
The foundational encyclical on biblical interpretation — establishing the principles of scriptural inerrancy, the relationship between scripture and natural science, and the proper method of Catholic exegesis.
The dogmatic constitution on divine revelation — addressing the nature of revelation, the transmission of revelation through scripture and tradition, the inspiration and interpretation of scripture, and the role of scripture in the life of the Church.
Liturgy
The pre-conciliar doctrinal treatment of the sacred liturgy — defining the Mass as the unbloody renewal of Calvary's sacrifice, explaining the priesthood, and establishing the theological principles for liturgical participation.
The constitution on the sacred liturgy — setting out the theological principles for liturgical renewal, the nature of the liturgy as the source and summit of the Church's life, and the norms for the reform of the rites.
Mariology
Defines as dogma that the Blessed Virgin Mary, having completed the course of her earthly life, was assumed body and soul into heavenly glory — the most recent exercise of papal infallibility.
Establishes the feast of the Queenship of Mary and sets out the theological foundations for Mary's royal dignity — grounded in her divine maternity and her unique association with Christ's redemptive work.