The great revival of trinitarian theology in the late twentieth century helped us to understand that the doctrine of the Trinity is not just one Christian doctrine among others. It is the comprehensive doctrine that gives unity to the whole Christian faith. Without it, the gospel itself collapses into incoherence. Whereas it was pretty much a dead letter in the eighteenth century, rejected by rationalists and Deists as an illogical conundrum, and held by many Christians merely as a badge of orthodoxy, it has become increasingly clear in our day that every area of Christian doctrine is illuminated and held together in unity by our confession of the Triune God.
One reason why it was regarded as unintelligible by rationalists and Deists, and as mere “ivory tower” theory by many believers, was that it had become separated from the story of the gospel.
— Noble, T.A. (2013-02-19). Holy Trinity: Holy People: The Theology of Christian Perfecting (Didsbury Lecture Series) (p. 128). Cascade Books, an Imprint of Wipf and Stock Publishers. Kindle Edition.