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One God as a Trinity of Persons

Catholics are monotheistic, meaning that they believe there's only one God. This one God is believed to have revealed himself as three persons (the Trinity): the Father, the Son, and the Holy Spirit.

God in people's lives

God in people's lives

  • Belief in the Trinity helps Catholics to understand the ways in which God is present in their lives:
    • God the Father is also often called the Creator.
    • God the Son took human form as Jesus, who is divine and human.
    • God the Holy Spirit inspired the apostles at Pentecost and is believed to be the active presence of God in the world today.
The Trinity in quote

The Trinity in quote

  • ‘Christians are baptised in the name of the Father and of the Son and of the Holy Spirit…. The faith of all Christians rests on the Trinity.’ [CCC 232]
    • (CCC = Catechism of the Catholic Church, a summary of Catholic beliefs and teachings).
The Trinity as one?

The Trinity as one?

  • For some Christians, belief in the Trinity is confusing because it appears to contradict belief in one God.
    • If there were many gods, God could not be all-powerful.
  • In fact, Christians believe that God is three persons, but just one God.
  • Some have described the persons of the Trinity as being three persons with one shared ‘substance’, meaning that they are three persons with one shared divine nature.
Analogies

Analogies

  • Some Christian writers have tried to describe the Trinity using analogy (by comparing it to something else).
    • St Patrick said that the Trinity is like a shamrock, which has three clear parts to it but is only one leaf.
    • Others have pointed to the three forms of H2O: ice, water and steam.

God as Three Persons in Scripture

Roman Catholics believe that the idea of God as three persons in one is supported by scripture.

God the Father

God the Father

  • God the Father is seen in the Old Testament as the Creator in the Book of Genesis (and references to God as Creator can be found elsewhere, e.g. in the Psalms) and as the Lawgiver in the Books of Exodus and Deuteronomy, among others.
  • God the Father is also seen in the New Testament, for example at Jesus’ baptism and at his Transfiguration.
God the Son

God the Son

  • Catholics believe that Isaiah’s prophecies (9:6-7) refer to Jesus as Son of God, describing a child who will be Mighty God and Prince of Peace.
  • The idea that Jesus is the Son of God is seen in the New Testament:
    • E.g. at the Annunciation when the Angel Gabriel tells Mary she has conceived God’s son.
    • E.g. when the voice of God the Father refers to Jesus as his son at his baptism.
God the Holy Spirit

God the Holy Spirit

  • Roman Catholic teaching says that the Spirit that surrounds the unformed world at the moment of creation is the Holy Spirit.
Jesus' baptism

Jesus' baptism

  • Some Catholics think that all three persons of the Trinity are present in the Gospel accounts of Jesus' baptism, for example in Mark 1:9-11.
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