…When we lose our ability to see the Trinity as directly connected to the gospel, we tend to reduce it to an issue of authority and mental obedience. No wonder, then, that the doctrine of the Trinity has been treated as something of a burden by many evangelicals.
But this dysfunction of the doctrine is only one side of the story of evangelical Trinitarianism. The other side of the story is that the life of every healthy church and every true Christian is a manifestation of the work of the Trinity. Evangelicalism, even when it is handling the doctrine of the Trinity as a foreign artifact difficult to deal with, is nevertheless always already immersed in the rich, Trinitarian reality of the gospel.
We are often in the strange position of being Trinitarian without knowing it, or of living in an encounter with the Father, Son, and Holy Spirit that we then give very weak and inadequate explanations of. We have the thing itself but act as if we do not know we have it.
Fred Sanders, The Deep Things of God (Wheaton: Crossway, 2010), 44.