Within Christianity, the doctrine of the Trinity states that God is a single Being who exists, simultaneously and eternally, as a perichoresis of three persons (personae, prosopa): Father (the Source, the Eternal Majesty); the Son (the eternal Logos or Word, incarnate as Jesus of Nazareth); and the Holy Spirit (the Paraclete or advocate). Since the 4th Century AD, in both Eastern and Western Christianity, this doctrine has been stated as "One God in Three Persons," all three of whom, as distinct and co-eternal "persons" or "hypostases," share a single Divine essence, being, or nature. Supporting the doctrine of the Trinity is known as Trinitarianism, and is opposed to the positions of Binitarianism (two deities/persons/aspects), and Unitarianism (one deity/person/aspect), which are held by some minor Christian groups.
The word "Trinity" comes from "Trinitas", a Latin abstract noun that most literally means "three-ness" (or "the property of occurring three at once"). Or, simply put, "three are one". The first recorded use of this Latin word was by Tertullian in about 200, to refer to Father, Son and Holy Spirit, or, in general, to any set of three things.
The Greek term used for the Christian Trinity, "Τριάς" (a set of three or the number three),[1] has given the English word triad. The Sanskrit words, "Trimurti or Trinatha," has a similar meaning, as has "Dreifaltigkeit" in German, and many other words in other languages.
The New Testament does not use the word "Τριάς" (Trinity), but only speaks of God (often called "the Father"), of Jesus Christ (often called "the Son"), and of the Holy Spirit, and of the relationships between them. The word "Trinity" began to be applied to them only in the course of later theological reflection.
The earliest Christians were noted for their insistence on the existence of one true God, in contrast to the polytheism of the prevailing culture. While maintaining strict monotheism, they believed also that the man Jesus Christ was at the same time something more than a man (a belief reflected, for instance, in the opening verses of the Letter to the Hebrews, which describe him as the brightness of God's glory and bearing the express image of God's own being, and, yet more explicitly, in the prologue of the Gospel according to John) and also with the implications of the presence and power of God that they believed was among them and that they referred to as the Holy Spirit. The Epistle to the Colossians even goes so far as to state that "in [Jesus] lives all the fullness of Deity bodily" (Colossians 2:9).
The importance for the first Christians of their faith in God, whom they called Father, in Jesus Christ, whom they saw as the Son of God, the Word of God (Gospel of John), King, Saviour (Martyrdom of Polycarp), Master (First Apology of Justin Martyr), and in the Holy Spirit is expressed in formulas that link all three together, such as those in the Gospel according to Matthew, the Great Commission: "Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit" (Matthew 28:19); and in the Second Letter of St Paul to the Corinthians: "The grace of the Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all" (2 Corinthians 13:14).
Conclusions about how best to explain the association of Jesus Christ and the Holy Spirit with the one God developed gradually and not without controversy. Christians had to reconcile their belief in the divinity of Jesus Christ with their belief in the one-ness of God. In doing so, some stressed the one-ness to the point of considering Father, Jesus and Holy Spirit as merely three modes or roles in which God shows himself to mankind; others stressed the three-ness to the point of positing three divine beings, with only one of them supreme and God in the full sense. Only in the fourth century were the distinctness of the three and their unity brought together and expressed in mainline Christianity in a single doctrine of one essence and three persons. Some Christians still debate the differences found in the New Testament, where Christ declared "I and my Father are one," but also prayed on the cross, "Eloi, Eloi, lama sabachthani" (My God, my God, why have you forsaken me?), which is often explained that first sentence refers to Jesus' divine nature and the second one to his human nature; another explanation is that the prayer on the cross quotes Psalm 22:1 in order to name the entire Psalm, interpreted as prophesying Jesus' crucifixion; and still others say that it is a ridiculous notion that this man is yelling at himself that he is abandoning himself.
In 325, the Council of Nicaea adopted a term for the relationship between the Son and the Father that from then on was seen as the hallmark of orthodoxy; it declared that the Son is "of the same substance" (ὁμοούσιος) as the Father. This was further developed into the formula "three persons, one substance". The answer to the question "What is God?" indicates the one-ness of the divine nature, while the answer to the question "Who is God?" indicates the three-ness of "Father, Son and Holy Spirit." It is also worthy to note that this council was set up and organized by the Roman Emperor Constantine I, who for years remained a Christian catechumen and was not baptized until near the end of his life. He was more interested in solidifying his empire under one religion rather than in taking sides in the debate between the Arians and the orthodox. Also the Pope of the time did not show up to this council, but instead sent delegates; as did many of the top clergy of the time. Furthermore, as the council went on less and less people attended.[citation needed]

The Council of Nicaea was reluctant to adopt language not found in Scripture, and ultimately did so only after Arius showed how all strictly biblical language could also be interepreted to support his belief, that there was a time before Jesus was created when he did not exist. In adopting non-biblical language, the council's intent was to preserve what they thought the Church had always believed, that Jesus is fully God, coeternal with God the Father and God the Holy Spirit.
Historically, the lack of an explicit scriptural basis for the Trinity was viewed as a disquieting problem,[citation needed] and there is evidence indicating that one mediaeval Latin writer, while purporting to quote from the First Epistle of John, inserted a passage now known as the Comma Johanneum which explicitly references the Trinity. It may have begun as a marginal note quoting a homily of Cyprian that was inadvertently taken into the main body of the text by a copyist.[1] The Comma found its way into several later copies, and was eventually back-translated into Greek and included in the third edition of the Textus Receptus which formed the basis of the King James Version. Erasmus, the compiler of the Textus Receptus, noticed that the passage was not found in any of the Greek manuscripts at his disposal and refused to include it until presented with an example containing it, which he rightly suspected was concocted after the fact.[2] Isaac Newton, known mainly for his scientific and mathematical discoveries, noted that many ancient authorities failed to quote the Comma when it would have provided substantial support for their arugments, suggesting it was a later addition.[3] Modern textual criticism has since concurred with his findings; many modern translations now either omit the passage, or make it clear that it is not found in the early manuscripts.
The word "Trinity" comes from "Trinitas", a Latin abstract noun that most literally means "three-ness" (or "the property of occurring three at once"). Or, simply put, "three are one". The first recorded use of this Latin word was by Tertullian in about 200, to refer to Father, Son and Holy Spirit, or, in general, to any set of three things.
The Greek term used for the Christian Trinity, "Τριάς" (a set of three or the number three),[1] has given the English word triad. The Sanskrit words, "Trimurti or Trinatha," has a similar meaning, as has "Dreifaltigkeit" in German, and many other words in other languages.
The New Testament does not use the word "Τριάς" (Trinity), but only speaks of God (often called "the Father"), of Jesus Christ (often called "the Son"), and of the Holy Spirit, and of the relationships between them. The word "Trinity" began to be applied to them only in the course of later theological reflection.
The earliest Christians were noted for their insistence on the existence of one true God, in contrast to the polytheism of the prevailing culture. While maintaining strict monotheism, they believed also that the man Jesus Christ was at the same time something more than a man (a belief reflected, for instance, in the opening verses of the Letter to the Hebrews, which describe him as the brightness of God's glory and bearing the express image of God's own being, and, yet more explicitly, in the prologue of the Gospel according to John) and also with the implications of the presence and power of God that they believed was among them and that they referred to as the Holy Spirit. The Epistle to the Colossians even goes so far as to state that "in [Jesus] lives all the fullness of Deity bodily" (Colossians 2:9).
The importance for the first Christians of their faith in God, whom they called Father, in Jesus Christ, whom they saw as the Son of God, the Word of God (Gospel of John), King, Saviour (Martyrdom of Polycarp), Master (First Apology of Justin Martyr), and in the Holy Spirit is expressed in formulas that link all three together, such as those in the Gospel according to Matthew, the Great Commission: "Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit" (Matthew 28:19); and in the Second Letter of St Paul to the Corinthians: "The grace of the Lord Jesus Christ and the love of God and the fellowship of the Holy Spirit be with you all" (2 Corinthians 13:14).
Conclusions about how best to explain the association of Jesus Christ and the Holy Spirit with the one God developed gradually and not without controversy. Christians had to reconcile their belief in the divinity of Jesus Christ with their belief in the one-ness of God. In doing so, some stressed the one-ness to the point of considering Father, Jesus and Holy Spirit as merely three modes or roles in which God shows himself to mankind; others stressed the three-ness to the point of positing three divine beings, with only one of them supreme and God in the full sense. Only in the fourth century were the distinctness of the three and their unity brought together and expressed in mainline Christianity in a single doctrine of one essence and three persons. Some Christians still debate the differences found in the New Testament, where Christ declared "I and my Father are one," but also prayed on the cross, "Eloi, Eloi, lama sabachthani" (My God, my God, why have you forsaken me?), which is often explained that first sentence refers to Jesus' divine nature and the second one to his human nature; another explanation is that the prayer on the cross quotes Psalm 22:1 in order to name the entire Psalm, interpreted as prophesying Jesus' crucifixion; and still others say that it is a ridiculous notion that this man is yelling at himself that he is abandoning himself.
In 325, the Council of Nicaea adopted a term for the relationship between the Son and the Father that from then on was seen as the hallmark of orthodoxy; it declared that the Son is "of the same substance" (ὁμοούσιος) as the Father. This was further developed into the formula "three persons, one substance". The answer to the question "What is God?" indicates the one-ness of the divine nature, while the answer to the question "Who is God?" indicates the three-ness of "Father, Son and Holy Spirit." It is also worthy to note that this council was set up and organized by the Roman Emperor Constantine I, who for years remained a Christian catechumen and was not baptized until near the end of his life. He was more interested in solidifying his empire under one religion rather than in taking sides in the debate between the Arians and the orthodox. Also the Pope of the time did not show up to this council, but instead sent delegates; as did many of the top clergy of the time. Furthermore, as the council went on less and less people attended.[citation needed]
The Council of Nicaea was reluctant to adopt language not found in Scripture, and ultimately did so only after Arius showed how all strictly biblical language could also be interepreted to support his belief, that there was a time before Jesus was created when he did not exist. In adopting non-biblical language, the council's intent was to preserve what they thought the Church had always believed, that Jesus is fully God, coeternal with God the Father and God the Holy Spirit.
Historically, the lack of an explicit scriptural basis for the Trinity was viewed as a disquieting problem,[citation needed] and there is evidence indicating that one mediaeval Latin writer, while purporting to quote from the First Epistle of John, inserted a passage now known as the Comma Johanneum which explicitly references the Trinity. It may have begun as a marginal note quoting a homily of Cyprian that was inadvertently taken into the main body of the text by a copyist.[1] The Comma found its way into several later copies, and was eventually back-translated into Greek and included in the third edition of the Textus Receptus which formed the basis of the King James Version. Erasmus, the compiler of the Textus Receptus, noticed that the passage was not found in any of the Greek manuscripts at his disposal and refused to include it until presented with an example containing it, which he rightly suspected was concocted after the fact.[2] Isaac Newton, known mainly for his scientific and mathematical discoveries, noted that many ancient authorities failed to quote the Comma when it would have provided substantial support for their arugments, suggesting it was a later addition.[3] Modern textual criticism has since concurred with his findings; many modern translations now either omit the passage, or make it clear that it is not found in the early manuscripts.

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