- Introduction
- The church and its history
- The essence and identity of Christianity
- The history of Christianity
- The primitive church
- The internal development of the early Christian Church
- Relations between Christianity and the Roman government and the Hellenistic culture
- The early liturgy, the calendar, and the arts
- The alliance between church and empire
- Theological controversies of the 4th and 5th centuries
- Liturgy and the arts after Constantine
- Political relations between East and West
- Literature and art of the “Dark Ages”
- Missions and monasticism
- The Photian schism and the great East–West schism
- From the schism to the Reformation
- Christianity from the 16th to the 20th century
- Contemporary Christianity
- Christian doctrine
- The nature and functions of doctrine
- Scripture and tradition: the apostolic witness
- Evangelism: the first teaching about the God of Jesus Christ
- Catechesis: instructing candidates for baptism
- Liturgy: the school and feast of faith
- Ethics: obeying the truth
- Aversion of heresy: the establishment of orthodoxy
- Apologetics: defending the faith
- Restatement: respecting language and knowledge
- Inculturation: respecting places and peoples
- Dogma: the most authoritative teaching
- Consensus: patterns of agreement
- Theology: loving God with the mind
- Symbolics: creeds and confessions
- Development: the maturation of understanding
- Schism: division over substantial matters
- Controversy: fighting over the faith
- Ecumenism: speaking the truth in love
- God the Father
- God the Son
- God the Holy Spirit
- The Holy Trinity
- Anthropology
- What it is to be human
- The human as a creature
- The human as the image of God
- Human redemption
- The problem of suffering
- The resurrection of the body
- Progressive human perfection
- The “new man”: The human being in the light of Christ
- The “reborn human”
- Human liberation
- Joy in human existence
- The charismatic believer
- Christian perfection
- Fellow humans as the present Christ
- The church
- Church tradition
- Eschatology
- Expectations of the Kingdom of God in early Christianity
- Expectations of the Kingdom of God in the medieval and Reformation periods
- Expectations of the Kingdom of God in the post-Reformation period
- The role of imminent expectation in missions and emigrations
- Eschatological expectations and secularization
- Concepts of life after death
- Aspects of the Christian religion
- Christian philosophy
- Christian mysticism
- Christian myth and legend
- The Christian community and the world
- The relationships of Christianity
- Christian missions
- Ecumenism
- Christianity and world religions
The cosmological argument
Aquinas gave the first-cause argument and the argument from contingency—both forms of cosmological reasoning—a central place for many centuries in the Christian enterprise of natural theology. (Similar arguments also appeared in parallel strands of Islamic philosophy.) Thomas’s formulations (Summa theologiae, I, Q. 2, art. 3) were refined in modern neo-Thomist discussions and remained topics of Christian philosophical reflection during the 20th century.
The first-cause argument begins with the assumption that there is change in the world. Change is always the effect of some cause or causes. Each cause is itself the effect of a further cause or set of causes; this chain moves in a series that either never ends or is completed by a first cause, which must be of a radically different nature in that it is not itself caused. Such a first cause is an important aspect, though not the entirety, of what Christianity means by God.
Although taking a different route, the argument from contingency follows the same basic movement of thought from the nature of the world to its ultimate ground. It starts with the premise that everything in the world is contingent for its existence upon other factors. Its presence is thus not self-explanatory but can only be understood by reference beyond itself to prior or wider circumstances that have brought it about. These other circumstances are also contingent, pointing beyond themselves for the ground of their intelligibility. If this explanatory regress is unending, explanation is perpetually postponed and nothing is finally explained. The existence of anything and everything thus remains ultimately unintelligible. But rational beings are committed to the search for intelligibility and cannot rest content until it is found. The universe can only finally be intelligible as the creation of an ontologically necessary being who is eternal and whose existence is not contingent upon anything else. This is also part of what Christianity has meant by God.
Criticism of these arguments points to the possibility that there is no first cause because the universe had no beginning, having existed throughout time, and is itself the necessary being that has existed eternally and without dependence upon anything else. Proponents of the cosmological argument reply that the existence of such a universe, as a procession of contingent events without beginning, would still be ultimately unintelligible. On the other hand, a personal consciousness and will, constituting a self-existent Creator of the universe, would be intrinsically intelligible; for human beings have experience in themselves of intelligence and free will as creative. Critics respond that insofar as the argument is sound it leaves one with the choice between believing that the universe is ultimately intelligible, because created by a self-existent personal will, or accepting that it is finally unintelligible, simply the ultimate given brute fact. The cosmological argument does not, however, compel one to choose the first alternative; logically, the second remains equally possible.
What made you want to look up Christianity?