Within Christianity, the doctrine of the Trinity states that God is a single Being who exists, simultaneously and eternally, as a communion 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. 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.\n\n\nThe 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.\n\nThe 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 word, "Trimurti," has a similar meaning, as has "Dreifaltigkeit" in German, and many other words in other languages.\n\nThe 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.\n\nThe 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 reflection of God's glory and bearing the impress 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. St Paul even goes so far as to state that "in [Jesus] lives all the fulness of Deity bodily" (Colossians 2:9).\n\nThe importance for the first Christians of their faith in God, whom they called Father, in Jesus Christ, whom they saw as Son of God, 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).\n\nConclusions 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," 