It’s important to define the terms, so the rest of the doctrine of the Trinity can be clear—or clear enough.
1.. Where does the word Trinity come from?
It comes from the Latin word trinitas, meaning “threeness.” A better word is Triunity, which means “three in one.”
Fuller meaning of Triunity: Three persons (Father, Son, and Spirit) in one essence or one God.
2.. Is the word Trinity found in the Bible?
No, because the New Testament authors were engaged in other issues, like church life and salvation for Jews and gentiles. However, they assumed the reality of the Trinity, which is greater than a label.
Please see The Trinity: What Does the Bible Say?
3.. Are the words essence and substance and being interchangeable?
For our purposes they are, but some theologians, like Berkoff (p. 87), explain the fine nuances between the three terms. But let’s not get into them at a basic level, as this website.
In these posts on the Trinity I almost invariably use essence.
The meaning of essence is as follows:
God’s constitutional nature or his fundamental nature (Berkoff p. 87).
EDT (2nd ed.): “An essence consists in a thing’s most basic properties, what it is most fundamental” (p. 279).
By essence or nature is meant what something is, and essence is a set of characteristics—properties necessary to the thing … For example, it is necessary to the essence of a triangle that it has the following characteristics:
(1) It must have three sides
(2) It must have three corners or angles
(3) The sum of the three angles must be 180 degrees (p. 550, emphasis original)
Without those three properties, a triangle would not be a triangle, but something else. So now we can distinguish it from a square, for example.
Webster’s dictionary: “ultimate nature of a thing.”
4.. What does subsistence mean?
It means God’s mode of existing as Father, Son and Holy Spirit and how they operate between themselves and in relationship with humankind. It might be a rough synonym for existence.
To denote these distinctions [between God’s three persons] Greek writers generally employed the term hypostasis, while Latin authors used the term persona and sometimes substantia. Because the former was apt to be misleading and the latter ambiguous, the Schoolmen [Medieval scholars] coined the word subsistentia (p. 87).
Bottom line: subsistence can be often swapped out for person, and vice-versa, for our purposes here at this website. But modern theologians listed in the Sources, below, don’t use it much.
5.. What does person mean?
A living being who thinks, feels, and wills.
Personhood is traditionally understood as one who has intellect, feelings, and will. All three characteristics are attributed to all three members of the Trinity in Scripture. Essentially, personhood refers to an ‘I,’ a ‘who,’ or a subject. Each ‘I’ in the Trinity possesses (by virtue of its one common nature) the power to think, feel, and choose. Personhood itself is the I-ness or who-ness. (p. 541)
Translation: person means ‘I’ or ‘who,’ a living being, as distinct from a thing that can’t feel, think or choose. It means one who has mind, feelings, and will. All three persons of the Trinity have them. They are persons.
6.. What does attribute mean, and how does it relate to the Trinity?
Click on What a Divine Attribute Is
7.. Is there a summary of the uses of the terms?
Here is one:
Modes of Subsistence
|From Frame p. 482. These words are not biblical, for the Bible does not explain the Trinity formally and systematically; rather it assumes that Christ and the Spirit are fully God, and we have to draw conclusions from those verses. Yet there is nothing wrong with using those terms to clarify matters for the Church today.
Personae in Latin is plural for singular persona. Hypostaseis in Greek is plural for singular hypostasis.
8.. What dies Godhead mean?
It is an old term for divine being or nature. It is often employed to contrast the divine nature with the three persons.
9.. What does the ontological Trinity mean?
Ontos means existence, and in this case it is used for the Trinity as he exists necessarily and eternally, apart from creation and humanity. It is what God essentially is, in relation to his nature and to the three persons—Father, Son, and Holy Spirit.
10.. What does the economic Trinity mean?
The term is used in its old sense, “ordering of activities.” This was used in the household, as well, ordering the full activities there.
It is the Trinity in relation to his creation and humanity, including the roles each person plays in redemption and providence.
11.. What is a short definition of the Trinity, so we can keep things straight?
Please click on The Trinity: What Are the Basics?
But here is one for now:
There are three persons—Father Son, and Holy Spirit—who share the same essence as one God.
So how does knowing about the Trinity help me know God better?
There is an entire ten-point post that answers that question, here:
Written by James Malcolm
ARTICLES IN THE TRIUNITY SERIES
The Trinity: What Are Key Terms?