Many Christians find the doctrine of the Trinity difficult to understand. Sadly, out of laziness or fear, some give up far too quickly and subsequently have little interest in diligently studying to grow in their understanding of God. Further, they commonly defend themselves by saying that if they love God in their heart, they need not concern themselves with deep understanding in their mind. Yet, Jesus himself urges us to love God with both our heart and mind.

While the doctrine of the Trinity is certainly difficult to understand, J. I. Packer reminds believers that it is nonetheless true: ‘The historic formulation of the Trinity . . . seeks to circumscribe and safeguard this mystery (not explain it; that is beyond us), and it confronts us with perhaps the most difficult thought that the human mind has ever been asked to handle. It is not easy; but it is true.’

Indeed, Christians should study the doctrine of the Trinity because God has given the church a great blessing in truthfully revealing something so glorious about himself; namely, he is triune. If he reveals it to us, he must consider it important and valuable for our relationship. He loves us deeply. He wants our relationship to be intimate and deep so he gives us precious insights into who he is. If we treasure our relationship with God, we should also treasure the revelation he gives us about himself so that we can know him as best as we are able.

Practically speaking, studying the doctrine of the Trinity helps believers appreciate their great salvation, which is frequently described in Paul’s writings as the work of the triune God. Our salvation is enriched as we understand this triune working. We come into relation with the Father and experience perfect fatherliness as he invests in us.

From Doctrine, Chapter 1. Trinity: God Is (pgs. 28–29). Order Doctrine now.