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· Summa I-II & II-II

Moral Theology

The science of human acts ordered to the supernatural end. Conscience, law, sin, the virtues and vices, the Decalogue, the precepts of the Church. Tanquerey, Alphonsus Liguori, and Aquinas's Secunda Pars form the principal sources.

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Primary Texts

42 chapters
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Glenn's Tour of the Summa

277 questions

Glenn's chapter-by-chapter précis of the Summa Theologica, with links to the full Latin–English text at New Advent.

Browse all 277 Tour questions for this tract →
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Magisterial Documents

20
Rerum Novarum
Leo XIII · 1891
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.
Casti Connubii
Pius XI · 1930
Reaffirms the sanctity and indissolubility of Christian marriage, condemns contraception, sterilisation, and eugenics, and establishes the doctrinal framework that Humanae Vitae later presupposes.
Quadragesimo Anno
Pius XI · 1931
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.
Pacem in Terris
John XXIII · 1963
John XXIII's encyclical on establishing universal peace in truth, justice, charity and liberty: the order of rights and duties between persons, between citizens and public authority, between states, and in the world community. The first encyclical addressed to all people of good will.
Dignitatis Humanae
Vatican Council II · 1965
Vatican II's Declaration on Religious Freedom: the right of every person to immunity from coercion in religious matters, grounded in human dignity, while the moral duty to seek the truth and embrace the true religion remains intact.
Gaudium et Spes
Vatican Council II · 1965
Vatican II's Pastoral Constitution on the Church in the Modern World: the dignity and vocation of the human person revealed in Christ, and the Church's teaching on marriage, culture, economic life, political community and peace.
Populorum Progressio
Paul VI · 1967
Paul VI's encyclical on the development of peoples: integral human development of the whole person and of every person, the social limits of property, the dangers of unbridled liberalism and of revolution, and solidarity between rich and poor nations.
Humanae Vitae
Paul VI · 1968
Reaffirms the Church's constant teaching that every act of marital intercourse must remain open to the transmission of life, prohibiting artificial contraception.
Familiaris Consortio
John Paul II · 1981
John Paul II's apostolic exhortation following the 1980 Synod of Bishops on the role of the Christian family: God's plan for marriage and the family, its four tasks, the teaching of Humanae Vitae, and pastoral care in difficult situations.
Laborem Exercens
John Paul II · 1981
John Paul II's encyclical on human work, for the ninetieth anniversary of Rerum Novarum: work in its objective and subjective senses, the priority of labour over capital, the rights of workers and unions, the indirect employer, and a spirituality of work.
Donum Vitae
Congregation for the Doctrine of the Faith · 1987
The Congregation for the Doctrine of the Faith's instruction on respect for human life in its origin and on the dignity of procreation: the respect owed to the human embryo, and the moral evaluation of artificial fertilisation, both heterologous and homologous.
Centesimus Annus
John Paul II · 1991
Written for the centenary of Rerum Novarum after the fall of Communism: the anthropological error of socialism, private property and the universal destination of goods, the free economy within a juridical and moral framework, democracy grounded in truth, and the critique of consumerism.
Veritatis Splendor
John Paul II · 1993
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.
Evangelium Vitae
John Paul II · 1995
John Paul II's encyclical on the value and inviolability of human life, with solemn confirmations of the Church's teaching on the killing of the innocent, abortion and euthanasia, and a call to build a culture of life.
Deus Caritas Est
Benedict XVI · 2005
Benedict XVI's first encyclical, on Christian love: the unity of eros and agape in creation and salvation history, God's love revealed in Christ, the inseparability of love of God and neighbour, and the Church's charitable activity as an expression of that love.
Dignitas Personae
Congregation for the Doctrine of the Faith · 2008
The Congregation for the Doctrine of the Faith's instruction on certain bioethical questions: it confirms Donum Vitae and applies its principles to newer techniques, including embryo freezing, preimplantation diagnosis, cloning, gene therapy, stem cell research and the use of biological material of illicit origin.
Caritas in Veritate
Benedict XVI · 2009
Benedict XVI's social encyclical on integral human development in charity and truth: charity as the heart of social doctrine, the legacy of Populorum Progressio, gratuitousness and the logic of gift in economic life, the link between life ethics and social ethics, and the challenge of technology.
Laudato Si'
Francis · 2015
Francis's encyclical on care for our common home: the ecological crisis and its human roots in the technocratic paradigm, the Gospel of creation, integral ecology, and the call to ecological conversion.
Fratelli Tutti
Francis · 2020
Francis's encyclical on fraternity and social friendship: the parable of the Good Samaritan as a model for society, the universal destination of goods, a better kind of politics, dialogue, forgiveness and peace, the rejection of war and the death penalty, and the service of religions to fraternity.
Magnifica Humanitas
Leo XIV · 2026
Leo XIV's first encyclical, on safeguarding the human person in the time of artificial intelligence: the dignity of the person as the criterion for judging technology, the limits of AI, the rejection of transhumanism, and truth, work, freedom and peace in a culture of power.
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Philosophical Foundation

Catholic Philosophy
Ethics

Moral theology builds on ethics — the natural law, the virtues, the human good. Glenn's Ethics presents the philosophical foundation.

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