Pentecostalism is best understood as a mystical tradition of the church catholic. The claim may not be self-evident to readers because of the number of reservations and objections on a host of matters, but I would say that this way of casting Pentecostalism is the most faithful way to preserve its traditional impulses, concerns, priorities, and overall ethos—features that continue to be present in its most vital contemporary forms. These mystical features have been prominent at different stages of the church's history, but sadly, Protestantism generally and evangelicalism particularly have often avoided or dismissed these as part of the gospel witness.—Pentecostalism as a Christian Mystical Tradition, page xvi (emphasis original)<idle musing>
I would qualify that statement a bit and say that the Reformed wing of Protestantism and evangelicalism has avoided it. The Wesleyan-Arminian wing, and to a lesser extent the Lutheran-German wing have embraced it. One only needs to consult Wesley's writings to see the embrace of the best of the mystical tradition, and it continued through out the nineteenth century as well. In the Lutheran-Germanic wing you have the pietistic impulse, which emphasized the mystical.
Because the Reformed are the ones who tend to write the history books and control the narrative, the assumption is made that they speak for all. Not much different than now, is it, with the Gospel Coalition claiming to speak for evangelicalism. But, that small caveat aside he is correct and this book looks to be a marvelous read. Come along for the ride!