INTRODUCTION
The Trinity is the central doctrine of the Christian faith because it is the doctrine of God Himself. Getting it wrong renders all other theological pursuits nonsensical. Like attempting to learn scuba-diving in the middle of the Great Sand Dunes. It might feel like a complicated doctrine, but we ought not to be intimidated by this doctrine. It’s not as if you won’t be let into heaven if you once were teaching a Sunday School class and used eggs as a metaphor for the Trinity. Just don’t do it again. This is one doctrine where charity should be shown in the articulation of it; severe strictness should be shown to someone who is in error and then doubles down on his error after being shown his error. St. Augustine once hedged his entire book on the Trinity with this, “If herein I am foolish, let him who knows better correct me.” To which I reply, “Ditto.”
THE TEXT
“Beloved, if God so loved us, we ought also to love one another. No man hath seen God at any time. If we love one another, God dwelleth in us, and his love is perfected in us. Hereby know we that we dwell in him, and he in us, because he hath given us of his Spirit. And we have seen and do testify that the Father sent the Son to be the Saviour of the world. Whosoever shall confess that Jesus is the Son of God, God dwelleth in him, and he in God. And we have known and believed the love that God hath to us. God is love; and he that dwelleth in love dwelleth in God, and God in him. 1 John 4:11-16 KJV
SUMMARY OF THE TEXT
While our systematic theology ought to begin with this doctrine of the trinity and unity of God, it is striking that the clearest Biblical teaching on the Trinity is in the context of our salvation. We see that here in this passage. The duty to love one another is rooted in God’s love toward us (v11). God’s love, as we will see shortly, is triune. John explains that the invisible God is not the same thing as the unknowable God (v12). If believers love one another, this is only possible because God dwells in them, perfecting His love in them and through them (v12). How do we know that this love towards each other is the fruit of the triune God’s love toward us? Because God gave us His Spirit (v13), which is what our baptism is a promise and seal of (1 Jn. 2:20).
Though we cannot see God, the Apostles had seen the Son. This son had been sent by the Father. The Son was sent by the Father in order to be the Savior of the World (v14). In confessing that Jesus of Nazareth is the eternal Son of God, you are assured that God dwells in you (by His Spirit), and you dwell in God (v15). John places our knowledge and belief in God in the context of this love which God showed to us. That love is a united love of the Father, Son, and Spirit. The Father set His love upon His elect, the Son was sent to save the elect, and the Spirit seals the elect with that love. To dwell in God is to dwell in love (v16). To experience the love of God is to experience the triune love of God. Apart from the Trinity you not only do not, but cannot, encounter God’s love.
COMPREHENDING THE INCOMPREHENSIBLE
As we consider the Trinity, we are not simply considering a doctrine. We are considering God Himself. He is holy, holy, holy; meaning, He is utterly unlike anything else you can consider. Furthermore, you can’t consider Him without also considering your relationship and duties to this God. This is the pinnacle of applied theology. Who is God? What is your duty to Him?
Considering the Trinity is considering a mystery. However, that’s not the same thing as saying that He cannot be apprehended by faith. The whole of Scripture leaves us with two realities regarding God. First, there’s only one God, while three distinct persons are all referred to as God. Each divine person is equal in essence, power, and glory; yet still somehow distinct from the other two. God in His fullness is incomprehensible to us (Ps. 139:6). Yet, God has given His fullness to us in Christ (Jn. 1:16). The work of redemption revealed in the NT gives us a trinitarian order: the Father sent the Son to be our Savior, and the Spirit gives you eyes to see this.
THE ERROR OF SUBORDINATION
All errors in thinking about God lead to errors in morality. You cannot be fully human without faith in this God who is one God in three persons. This is simplifying tomes of orthodoxy into a simple statement, but all trinitarian errors are really some form of importing subordination into the God-head. Ancient heresies often subordinated the Son and Spirit to the Father. Modern Pentecostals tend to fall into the error of modalism, which subordinates the Father and Son to the Spirit. Throughout history people have exalted various virtues so high that they come to believe God must be subordinated to that virtue. The mushy progressive wants love (or their sappy and spineless version of love) to govern what God is like. Likewise, Islamists want justice (or their definition of it) to handcuff God.
However, there is either unity in the Godhead, or there is warfare. It is a ridiculous thing to try to conceive of such conflict within God. It isn’t as if the Father wants to save Mr. Jones, but the Son and Spirit are a bit skeptical that they can pull that off. Rather, we should see that in the economy of salvation we have God’s love to sinful man displayed in brilliant trinitarian glory.
God the Father determined to save you, before the foundation of the world, despite all your transgressions which He foresaw you would commit against Him. He did so not because you deserved it, but because He is love, and delights to show mercy. He showed this love by sending His Son to take on human flesh, and then die and rise again in your stead. The Father and the Son have sent the Spirit to dwell in you, so that you can enjoy the love of the Father towards the Son and the Son towards the Father.
In Augustine’s triumphant masterpiece on the Trinity, he gives wise counsel when it comes to approaching this doctrine: “And if this is understood with difficulty, the mind must be purged by faith, by more and more abstaining from sins, and by doing good works, and by praying with the groaning of holy desires; that by profiting through the divine help, it may both understand and love (Augustine, On the Trinity, Book IV, Chap. 21, Sec. 31).” In other words, if you’re having trouble understanding this, then trust God, stop sinning, go serve others, and pray some more. Very sensible counsel.
COMING UNTO GODS
The whole reason you were made is the contemplation and enjoyment of God. To put it another way, you exist in order that you might come unto God. He made you, but He did not then go off and hide.
Rather, your very being is itself a witness to your reason of two things: that God is and is a rewarder of those who diligently seek him. The highest good for your body is to serve God. The highest good for your soul is to believe in God. The highest good for your mind is to think upon God. Since He is three-in-one this means this is how you must serve Him, what you must believe about Him, and how you must think about Him. You were made to come unto God. But come unto Him as He is––trinity in unity––not as you imagine Him to be.
You were made to know, believe, and love the Living God. Contemplate the Father’s generosity towards you giving you life in the first place, and then giving you new life through His Son. Consider that Christ took on flesh, in order to share in your humanity in order to take it down into death and raise it up into immortal life. Cherish the glory that you have received the Spirit of God to confirm you in this fellowship with the Triune God.