Christianity has a unique understanding of God. God exists as a Trinity. But understanding the Trinity can stir up a lot of confusion. So let’s look at the fundamentals of this belief. And then uncover two secrets to understanding the Trinity.
What is the Trinity?
Christians believe in only one God. That means that Christianity is a monotheistic religion. We worship only one eternal and infinite God. Jesus affirmed monotheism by quoting the Shema (Deut. 6:4) in Mark 12:29. “Hear, O Israel: The Lord our God, the Lord is one.”
But this one God exists as a Trinity. “Trinity” means “Tri-Unity” or “Three-in-One.” In other words, the Trinity means one God existing as three distinct persons. The three Persons are Father (Matt. 6:9,32), Son (John 17:5), and Holy Spirit (Acts 5:3-4).
Criticizing The Trinity
If you are a new Christian, understanding the Trinity may seem hard to grasp. And skeptics often criticize the Trinity for two reasons:
- First, the Trinity is too complicated
- Second, the Trinity is impossible to understand and contradictory
Two Secrets to Understanding the Trinity
Before tackling those criticisms of the Trinity, we need to define two terms. These terms are two “secrets” to help us understand the Trinity. The two terms are “comprehend” and “apprehend.”
- “Comprehend” means that I understand the nature, significance, or meaning of it completely.
- “Apprehend” means that I know it, at least in part, not wholly.
Understanding the Trinity is Like Putting the Ocean in a Hole on the Beach
How is knowing these two words helpful in understanding the Trinity?
The famous painting “St. Augustine at the Seashore” represents a legend. It shows Augustine walking along a beach, lost in thought. He was puzzling over comprehensively understanding the Trinity.
He saw a young boy running back and forth to the ocean filling his bucket. The boy then emptied his bucket of water into a hole he had dug in the sand.
Augustine asked, “What are you doing.” The boy replied, “I’m trying to put the ocean into this hole.”
Augustine realized that the boy's task was futile. In the same way, his effort of trying to understand the infinite with a finite mind. No human could comprehend the Trinity in our tiny human minds. (1)
Is Understanding the Trinity Too Complicated?
Of course, God is complicated! The Trinity is a Christian "mystery." A mystery is something that an infinite and eternal God allows us to know about him only because it’s in the Bible.
So comprehensively understanding the Trinity is impossible with our finite minds (Rom. 11:33–36). But complexity and incomprehension are not the same things! C. S. Lewis addressed this issue:
“If Christianity was something we were making up, of course, we could make it easier. But it is not. We cannot compete, in simplicity, with people who are inventing religions. How could we? We are dealing with fact. Of course, anyone can be simple if he has no facts to bother about” (2)
Scriptural Evidence for the Trinity
God revealed himself through the Bible (1 Cor. 2:10–11; Heb. 1:1–2). Because of the Bible, we can “apprehend” many things about the Trinity.
We can apprehend that God exists as three distinct persons sharing one divine nature or essence (Matt. 3:16-17; John 10:30). Each member has a different role to play. For example:
- God the Father planned salvation (John 3:16; Eph. 1:4)
- The Son accomplished it on the cross (John 17:4; 19:30; Heb. 1:1-2) and the resurrection (Rom. 4:25; 1 Cor. 15:1-6)
- The Holy Spirit applies it to the lives of the believers (John 3:5; Eph. 4:30)
Here’s another example of a difference between the roles of the Son and the Holy Spirit:
- The Son submits to the Father (1 Cor. 11:3; 15:28)
- The Holy Spirit glorifies the Son (John 16:14)
The Trinity is an excellent example of why we must ground every Christian doctrine about God in Scripture (Ps. 19:7-14; 2 Tim. 3:14-17).
Analogies to Prove the Trinity is not Contradictory
The critic says that the Trinity is contradictory. They are wrong. Scripture is clear that there is one God who exists as three Persons. The “three-in-one” of the Trinity is not a contradiction.
Each number refers to a different aspect of the Trinity.
- The three refers to “Persons” (Father, Son, and Holy Spirit)
- The one relates to his “divine nature.”
These are different from each other.
In understanding the Trinity, we can “apprehend” enough from Scripture and logic to show that the Trinity is not contradictory.
Is that confusing? Consider this diagram of a triangle:
The one triangle (God’s one divine nature) has three corners (Persons of the Trinity). The three corners of the triangle must be distinct, present, and simultaneous to each other for the geometric shape to be a triangle. If one corner is missing, the geometric shape is not a triangle.
A triangle is a good illustration of the Trinity. But the triangle is finite, and God is infinite, so it is not a perfect illustration.
Distinguishing between three Persons and one divine nature resolves misunderstanding.
But what would be a contradiction? If we said the Trinity three and one in the exact same way!
- It would be a contradiction to say that the Trinity was three persons and one person
- Or three divine natures and one divine nature.
That would be contradictory.
A math analogy may also help. A critic might argue about God, “Doesn’t 1+1+1=3?” The Christian answers, “It would if our God were ‘tri-part,’ but he is not. He is ‘triune’ or represented by ‘1x1x1=1!’”
More Than Just Understanding the Trinity
The Trinity is so distinct from any other worldview that it should astonish you. Why?
There is no way that the mystery of the Trinity is a human invention. The God of all things chose the Bible to share his incredible nature with us. And Scripture shows how he interacts with us and has accomplished our salvation.
Why not spend some time reading through the Gospels or the New Testament letters? And see if you can uncover the ways that the Father, the Son, and the Holy Spirit are at work. And then worship God with an even greater understanding of who he is.
(1) Rengers, C. (2014). The 35 Doctors of the Church. Gastonia, NC: TAN Books.
(2) Lewis, C. S. (1953) Mere Christianity (p. 145). New York: Macmillan.