What Is the Trinity?
The "Trinity" is one of the most asked-about yet most abstract concepts of the Christian faith. This page summarizes, neutrally and descriptively, where the term comes from, how the Father, Son and Holy Spirit are spoken of in the Bible and within what debates the concept took shape in the early centuries. The aim is not to defend a particular interpretation or to settle a debate but to show the historical and conceptual framework of the concept and to help you read the relevant passages for yourself.
What do the words "Trinity" and "Teslis" mean?
"Teslis" is a word of Arabic origin meaning "threefoldness"; the same concept is also called "Kutsal Üçleme" (Holy Trinity) in Turkish. The Latin word "trinitas," its counterpart in Western languages, likewise means "threeness." An important point is this: the word "Trinity" itself does not appear as a heading in the text of the Bible; the term is a concept that came into use in later centuries to explain together the passages in which the Father, Son and Holy Spirit are mentioned. The word, then, is a technical term naming a reading of the text.
The Father, Son and Holy Spirit in the Bible
In the New Testament portion of the Bible, God is called "Father," Jesus Christ the "Son," and the Holy Spirit the active presence of God. These three names appear together in some passages: for example, in Matthew 28 Jesus sends his disciples to baptize "in the name of the Father and of the Son and of the Holy Spirit"; the opening of John associates the concept of the "Word" with Jesus; and in John 14-16 the Holy Spirit is promised as a "Helper." In the Christian tradition these three are said to be understood as the interrelated being of one God; how the text brings these expressions together is a matter of interpretation.
How did the concept take shape? The process of Nicaea
The concept of the Trinity took shape as Christian communities in the early centuries debated at length how the relationship between the Father, Son and Holy Spirit should be understood. These debates were addressed at major gatherings such as the Council of Nicaea in AD 325 and the Council of Constantinople that followed in 381; the shared text known today as the "Nicene Creed" was formed in this process. This shows that the concept was a historical development that arose after the Bible, out of the effort to interpret the text and find a common language. This page does not enter into the details of this process or its theological subtleties; it only describes the general historical framework.
Different traditions and this page's stance
The Trinity is accepted as a foundational concept of the faith in most of the main Christian traditions, including the Catholic, Orthodox and Protestant traditions; the emphases in detail can vary from tradition to tradition. Other monotheistic traditions such as Judaism and Islam, on the other hand, do not share this concept and understand the oneness of God differently. This page does not choose between these views, nor declare any of them right or wrong; it only reports how the concept is understood within the Christian tradition and where it comes from.
Where can I read about this on this site?
You can read the relevant passages here, chapter by chapter, free and ad-free. John is a good starting point for the concept of the "Word" and the identity of Jesus, Matthew for the passage containing the command to baptize, and Acts for the effect of the Holy Spirit on the first community. You can also reach the text directly by searching for a word on the search page or by clicking a verse reference in a blog post.
Start here
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What is the Trinity?
The Trinity is a concept that, in the Christian tradition, expresses one God understood as Father, Son and Holy Spirit in an interrelated way. The term came into use in later centuries to explain together the passages of the Bible that speak of these three.
Does the word "Trinity" appear in the Bible?
The word "Trinity" itself does not appear as a heading in the text. The Bible speaks of the Father, Son and Holy Spirit; "Trinity" is a technical term developed later to name these expressions together.
What does the Council of Nicaea have to do with it?
The Council of Nicaea in AD 325 and the Council of Constantinople that followed in 381 were major gatherings that debated how the relationship between the Father, Son and Holy Spirit should be understood. The shared text known today as the "Nicene Creed" was formed in this process.
Where do the Father, Son and Holy Spirit appear together?
For example, in Matthew 28 Jesus sends his disciples to baptize "in the name of the Father and of the Son and of the Holy Spirit"; in John 14-16 the Holy Spirit is promised as a "Helper." You can read these chapters here for free.
Does this page defend a particular view?
No. This page reports, neutrally, how the concept is understood in the Christian tradition and where it historically comes from; it does not choose between different traditions and beliefs, nor declare any of them right or wrong.