"For Barth, theology ‘is the most beautiful of the sciences’ . . . . When asked about the significance of reason, he simply replied, ‘I use it.’
And what is reason used for? Barth says that just as Philip asked the Ethiopian official in Acts 8 whether he understood what he was reading, so one can also ask, ‘Do you understand what you are believing?’
Theology seeks to help us understand what we read and believe. In theology, as Barth conceives it, one walks a path on which we follow not a principle but a person, Christ; and theology is about following Jesus Christ, following him in the realm of thinking. The Word of God that comes to us in Christ is not simply printed in a book."
(Quoted from Eberhard Busch, Barth, 2008)