Trinity, literally meaning three-in-one, ascribes a co-equal threeness to God that is not explicitly biblical. Nontrinitarians cite other examples of terms or phrases not found in the Bible; multiple "persons" in relation to God, the terms "God the Son", "God-Man", "God the Holy Spirit", "eternal Son", and "eternally begotten". While the Trinitarian term hypostasis is found in the Bible, it is used only once in reference to God where it states that Jesus is the express image of God's person. The Bible does not explicitly use the term in relation to the Holy Spirit nor explicitly mentions the Son having a distinct hypostasis from the Father. The First Council of Nicaea included in its Creed the major term homoousios (of the same essence), which was used also by the Council of Chalcedon to speak of a double consubstantiality of Christ, "consubstantial with the Father as touching his Godhead, and consubstantial with us as touching his manhood". Nontrinitarians accept what Pier Franco Beatrice wrote: "The main thesis of this paper is that homoousios came straight from Constantine's Hermetic background. ... The Plato recalled by Constantine is just a name used to cover precisely the Egyptian and Hermetic theology of the "consubstantiality" of the Logos-Son with the Nous-Father, having recourse to a traditional apologetic argument. In the years of the outbreak of the Arian controversy, Lactantius might have played a decisive role in influencing Constantine's Hermetic interpretation of Plato's theology and consequently the emperor's decision to insert homoousios in the Creed of Nicaea." Trinitarians see the absence of the actual word "Trinity" and other Trinity-related terms in the Bible as no more significant than the absence in the Bible of the words "monotheism", "omnipotence", "oneness", "Pentecostal", "apostolic", "incarnation" and even "Bible" itself. They maintain that, 'while the word Trinity is not in the Bible, the substance or drift of the doctrine is definitely biblical, if not explicitly than at least implicitly.' Holy Spirit Nontrinitarian views about the Holy Spirit differ from mainstream Christian doctrine and generally fall into several distinct categories. Most scriptures traditionally used in support of the Trinity refer to the Father and the Son, but not to the Holy Spirit. Unitarian Groups with Unitarian theology such as Polish Socinians, the 18th–19th-century Unitarian Church and Christadelphians consider the Holy Spirit to be an aspect of God's power rather than a person. Christadelphians believe that the phrase Holy Spirit refers to