Trinity

The Christian doctrine of the Trinity defines God as three divine persons or hypostases:[1] the Father, the Son (Jesus Christ), and the Holy Spirit. The three persons are distinct, yet are one "substance, essence or nature".[2] A nature is what one is, while a person is who one is.[3][4][5]
The Trinity is considered to be a mystery of Christian faith.[6] According to this doctrine, there is only one God in three persons. Each person is God, whole and entire. They are distinct from one another in their relations of origin: as the Fourth Lateran Council declared, "it is the Father who generates, the Son who is begotten, and the Holy Spirit who proceeds". While distinct in their relations with one another, they are one in all else. The whole work of creation and grace is a single operation common to all three divine persons, who at the same time operate according to their unique properties, so that all things are from the Father, through the Son and in the Holy Spirit.[6] The three persons are co-equal, co-eternal and consubstantial.
Trinitarianism (one deity in three persons) contrasts with nontrinitarian positions which include Binitarianism (one deity in two persons, or two deities), Unitarianism (one deity in one person, analogous to Jewish interpretation of the Shema and Muslim belief in Tawhid), Oneness Pentecostalism or Modalism (one deity manifested in three separate aspects), and social trinitarianism (three persons united by mutual love and accord).



Etymology

The English word Trinity is derived from Latin Trinitas, meaning "the number three, a triad".[7] This abstract noun is formed from the adjective trinus (three each, threefold, triple),[8] as the word unitas is the abstract noun formed from unus (one).
The corresponding word in Greek is Τριάς, meaning "a set of three" or "the number three".[9]
The first recorded use of this Greek word in Christian theology (though not about the Divine Trinity) was by Theophilus of Antioch in about 170. He wrote:[10][11]
"In like manner also the three days which were before the luminaries, are types of the Trinity [Τριάδος], of God, and His Word, and His wisdom. And the fourth is the type of man, who needs light, that so there may be God, the Word, wisdom, man."[12]
Tertullian, a Latin theologian who wrote in the early 3rd century, is credited with using the words "Trinity",[13] "person" and "substance"[14] to explain that the Father, Son, and Holy Spirit are "one in essence—not one in Person".[15]
About a century later, in 325, the First Council of Nicaea established the doctrine of the Trinity as orthodoxy and adopted the Nicene Creed, which described Christ as "God of God, Light of Light, very God of very God, begotten, not made, being of one substance with the Father".






Shield of the Trinity

The Shield of the Trinity or Scutum Fidei is a traditional Christian visual symbol which expresses many aspects of the doctrine of the Trinity, summarizing the first part of the Athanasian Creed in a compact diagram. In late medieval England and France, this emblem was considered to be the heraldic arms of God (and of the Trinity).



Basic description

This diagram consists of four nodes (generally circular in shape) interconnected by six links. The three nodes at the edge of the diagram are labelled with the names of the three persons of the Trinity (traditionally the Latin-language names, or scribal abbreviations thereof): The Father ("PATER"), The Son ("FILIUS"), and The Holy Spirit ("SPIRITUS SANCTUS"). The node in the center of the diagram (within the triangle formed by the other three nodes) is labelled God (Latin "DEUS"), while the three links connecting the center node with the outer nodes are labelled "is" (Latin "EST"), and the three links connecting the outer nodes to each other are labelled "is not" (Latin "NON EST").
The links are non-directional — this is emphasized in one thirteenth-century manuscript by writing the link captions "EST" or "NON EST" twice as many times (going in both directions within each link), and is shown in some modern versions of the diagram by superimposing each occurrence of the "is" / "is not" text on a double-headed arrow ↔ (rather than enclosing it within a link). So the following twelve propositions can be read off the diagram:







Brief history

The precise origin of this diagram is unknown, but it was evidently influenced by 12th-century experiments in symbolizing the Trinity in abstract visual form — mainly by Petrus Alfonsi's Tetragrammaton-Trinity diagram of c. 1109 (and possibly also by Joachim of Fiore's different Tetragrammaton-Trinity diagram of three circles, which in turn led to the Borromean rings being used as a symbol of the Trinity [1]), in combination with the Athanasian Creed. The Shield of the Trinity diagram is attested from as early as a c. 1208–1216 manuscript of Peter of Poitiers' Compendium Historiae in Genealogia Christi, but the period of its most widespread use was during the 15th and 16th centuries, when it is in found in a number of English and French manuscripts and books (such as the Sherborne Missal), and as part of stained-glass windows and ornamental carvings in a number of churches (many in East Anglia). The diagram was used heraldically from the mid-13th century, when a shield-shaped version of the diagram (not actually placed on a shield) was included among the c. 1250 heraldic shields in Matthew Paris' Chronica Majora, while the c. 1260 allegorical illustrations of a knight battling the seven deadly sins in a manuscript of William Peraldus' Summa Vitiorum, and of a woman penitent fending off diabolical attacks in the De Quincy Apocalypse, show the diagram placed on a shield. In the 15th century, one form of the Shield of the Trinity was considered to be the coat of arms of God (see discussion below). The use of the diagram declined in England with the rise of Protestantism, and from the 17th century to the early 19th century, it was mainly of interest to historians of heraldry; but beginning in the 19th century it underwent a limited revival as an actively used Christian symbol among English-speaking Christians, partly due to being included in books such as the Handbook of Christian Symbolism by W.J. and G.A. Audsley (1865).