John Webster on Barth in “From the Substance to the Word:”

[R]evelation is no more and no less than the life of God himself turned to us, the Word of God coming to us by the Holy Spirit, Jesus Christ.’  Such a divine approach cannot be formalised into a set of axioms, and to attempt to do so (by, for example, developing a systematic biblical theology) is to take up a false stance to divine revelation, treating it as ‘a presupposition [Voraussetzung] which we can control.’  Properly undertaken, biblical theology effects no such settlement; it is simply ‘a series of attempted approximations, a collection of individual exegeses’.  What is required of the exegete is not systematic ambition but ‘surrender’.