Holy Trinity

The "Trinity" or, "Holy Trinity" of the Father, the Son, and the Holy Spirit

note: see glossary entry on "Holy"

The Holy Trinity is called collectively the "Godhead" or the "Triune"

also, the "Blessed Trinity"

Terminology of the Trinity

Godhead

The Trinity may also be referred to as the "Godhead"

= God in the full nature of the Trinity
- from Middle English God + hede (nature of)
note: the Father is the "source and origin" of the Godhead, but the Godhead indivisibly consists of the Father, the Son and the Holy Spirit
- see CCC 2789

hypostasis

refers to the "Persons" of God; in Latin persona

from Greek for "substance"
- from hypo- (under) + stasis (standing or position)

hypostasis is singular for "Person"
hypostases is plural for "Persons"

hypostatic union

refers to the "union of the divine and human natures... of the Son of God, Jesus Christ" (CCC Glossary)

i.e. that Jesus Christ was fully human and fully divine

Triune

a similar reference to "Godhead" for the Holy Trinity

but also used as an adjective, as in "the Triune God"

Athanasian Creed

or Quicunque vult

an important early Church statement and explanation of the Holy Trinity

from from CCC 266

"Now this is the Catholic faith: We worship one God in the Trinity and the Trinity in unity, without either confusing the persons or dividing the substance; for the person of the Father is one, the Son's is another, the Holy Spirit's another; but the Godhead of the Father, Son and Holy Spirit is one, their glory equal, their majesty coeternal"  (Athanasian Creed: DS 75; ND 16).

See
- entry on Athanasian Creed
- The "Athanasian" Creed (slightly different translation from EWTN)

The Trinity

The Holy Trinity is the mystery of God in three Persons: Father, Son, and Holy Spirit

the Trinisy consists of the
- Persons of God: Father Son and Holy Spirit
- Natures of God: Creator, Redeemer, and Sanctifier
the Trinity was source of much conflict and contention in the early Church
and, ultimately, a core tenant of Church doctrine
- Jews were offended that fellow Jews worshiped Christ, as Judaism was supposed to be monotheistic
- Romans considered Christians atheistic, as they rejected Roman gods and refused to worship Caesar
- gnostics and other heretics believed that Jesus fully God and not a Man, thus he was either not a man or not God

Shield of the Trinity (Scutum Fidei)

Basic "Shield of the Trinity" diagram (wikipedia)

Four variants of the "Shield of the Trinity"

derived from the Athanasian Creed
God (DEUS) is at the center
the three Persons are at the corners
the shiled was consiered the "Herald of God"

The forumulation of the Shield

note that all the links (connections) are bi-directional (go both ways)
EST means "is"
NON EST means "is not"

Thereby:

"The Father is God"

"The Son is God"
"The Holy Spirit is God"
"God is the Father"
"God is the Son"
"God is the Holy Spirit"
"The Father is not the Son"
"The Father is not the Holy Spirit"
"The Son is not the Father"
"The Son is not the Holy Spirit"
"The Holy Spirit is not the Father"
"The Holy Spirit is not the Son"

St. Thomas Aquinas on the Trinity

St. Thomas Aquinas thought deeply about the Trinity in Summa Theologica

his thought extends from the concepts of the Trinity and the Oneness of God:
One God
Two Processions
1. The Father > The Son (Generation)
2. The Father and The Son > Holy Spirit (Spiration)
- Three Persons
  1. The Father
  2. The Son
  3. The Holy Spirit
- Four Relations
  1. The Father > The Son = Paternity
  2. The Son < The Father = Filiation
  3. The Father and The Son > The Holy Spirit = Active Spiration (originiation)
  4. The Father and The Son < The Holy Spirit = Passive Spiration (procession)
- Five Notions
  1. The Father > innascibility or unbegottennes
  2. The Father > paternity, i.e. The Father > The Son
  3. The Father and The Son "spirate" the Holy Spirit
  4. The Son = both Filiation and Spiration
  5. The Holy Spirit = Procession
- notes:
  - St. Thomas wrote in Summa Theologica,
    - "Although there are four relations in God, one of them, spiration, is not separated from the person of the Father and of the Son, but belongs to both;"
  - these relations, originatinos, and processions are internal to God and not related to temporal process (outside of time)
  - See: