"We are not going to be able to reason ourselves back to paradise."
That is one of the closing sentences from Penner's book The End of Apologetics. The book as a whole is a critique of using an over reliance on expert reasoning as the primary means of combating skepticism and atheism in defense Christianity.
"... I cannot use the objective truths of Christianity to tear down others and think that I am thereby communicating the truth of the gospel."
He looks to the prophets for example of effective, fitting and appropriate witness:
"What is also true of prophets, then, is that while they challenge and even speak against their traditions, they are also more deeply committed to them than those who are comfortable in the status quo. It is precisely because they are so committed to their tradition and believe in its deepest impulses that prophets sometimes attack it. The prophetic call is always to a deeper fidelity to the founding event of the tradition, but not in such a way that controls it or even tries to make it into a univocal, monochromatic tradition."
And he looks to Paul whose approach is an example for us of what prophetic witness should be.
"Paul engages believers and unbelivers, Jews and Greeks, men and women, slaves and free, all patiently and carefully in terms of their concrete, particular identities within the context of their actual situations. He lives with those to whom he preaches. He eats with them. He works and worships with them. Consequently, his theological categories do not blind him to the particularities of those to whom he witnesses - to the point where Paul does not even think of others in terms of a "universal human condition," Paul's preaching calls the people of the nations not to be conformed to the theological categories he inherited from Jewish orthodoxy (e.g., "circumcision"), but to faithful confession of Jesus as Lord within their cultural forms, whatever they may be. It is as if for Paul, as missiologist Andrew Walls observes, Christianity "has no fixed cultural element" and is therefore "infinitely transferable." For not only can the Christian gospel be translated into new cultural and linguistic thought forms, but given the missionary imperative explicit in Paul's letters (and the entire biblical narrative", there is a sense in which the truth of the gospel requires this kind of translation: 'It is as though Christ himself actually grows through the work of mission.'"
And this, after Penner has initiated the chapter by conveying that the social dimension of Christian witness and states that "edification is taken to be the primary act of witness."
In closing out my comments about this interesting and, for me, difficult book, I direct your attention below to a page from The Book of Knowledge Encyclopedia 1952 edition. I grew up with this set and it helped to form me. This page shows the development of the pen from Roman times to the middle of the last century. You see that it has changed drastically as the medium upon which it writes has changed. This is a metaphor for Christian witness and even for Christian belief, in my opinion. Change will happen and we do not help ourselves if we become obsessed with using exclusively the tools that have outlived their usefulness.