Webster on Barth's engagement with philosophy

"Barth's insistence on speaking [with philosophy/non-Christian disciplines] on his own terms is not to be interpreted as obstinate reluctance to come out of his lair and talk to the rest of the world; quite the contrary: in writing, as in life, Barth showed remarkable openness to all manner of ideas, provided he is allowed to exercise Christian nonconformity."

—John Webster, Barth, 2nd ed. (New York: T&T Clark, 2000, 2004), p. 174