Here is a bit from one of my graduate students (used by Matt Payne with permission) on engaging postmodernism as a Pentecostal church and preacher. How does one engage those who, at best, question the notion of the meta-narrative? How does one do so while pointing to the story of God’s redemption in Christ and testified to by the Spirit? Through testimony.
I would like to suggest that honest, theologically-sound testimony is essentially embedded proclamation, specifically as it bears witness to the ongoing work of Christ, proclaimed orally, in writing, graphically or otherwise. Furthermore, I would suggest that embedded proclamation constitutes a form of preaching (witness), though itself not found . The activity of Christ, communicated faithfully by the witnessing community, performs the same function that liturgically embedded preaching does: it forms theology by communicating (as witness) what Christ has done and (prophetically) what can be expected of Christ in the future.
To that end, Walter Brueggemann suggests that the essence of prophecy is “a sustained effort to imagine the world as though YHWH were a real character and the defining agent in the life of the world.” Testimony performs the same function, though more concretely and in the past tense, much like Scripture. If God heals someone, or delivers them miraculously from an addiction, it would stand to reason that those actions re-presented as testimony would serve as witness to the ontic reality of God’s presence, nature, mission, and proximity to humanity. Testimony is at once recollection of the deeds of God and prophecy of what He will do in the future, whether that’s healing, deliverance, the Baptism of the Holy Spirit, salvation, etc.
It is the very nature of testimony to subtly undermine other counter narratives. It does this by offering another world, as it were, and suggesting the potentiality of others entering that same experience and likewise be transformed.
This is precisely the kind of writing I LOVE to read from my students! I pray our testimonies may do just this!
 Rick Wadholm Jr, “What is Preaching and What Makes it ‘Christian’?” a paper presented to The Socratic Club of Trinity Bible College and Graduate School Thursday, April 23, 2015.
 Revelation 19:10.
 Walter Brueggemann, The Practice of Prophetic Imagination: Preaching an Emancipating Word (Minneapolis: Fortress Press, 2012), 132.
 It could be argued that much of Scripture is in essence a series of testimonies. When considered in this light, it’s significant how much theology we distill not from explicit commands and propositions, but rather through our witness of God’s interaction with Israel and four author’s observations of Jesus’s earthly ministry.