Are we then to deduce that we should forget God, lay down our tools, and serve men in the Church – as though there were no Gospel? No, the right conclusion is that, remembering God, we should use our tools, proclaim the Gospel, and submit to the Church, because it is conformed to the kingdom of God. We must not, because we are fully aware of the internal opposition between the Gospel and the Church, hold ourselves aloof from the Church or break up its solidarity; but rather, participating in its responsibility, and sharing the guilt of its inevitable failure, we should accept it and cling to it. — I say the truth in Christ, I lie not, my conscience bearing witness with me in the Holy Ghost, that I have great sorrow and unceasing pain in my heart. This is the attitude to the Church engendered by the Gospel. He who hears the gospel and proclaims it does not observe the Church from outside. He neither misunderstands it and rejects it, nor understands it and – sympathizes with it. He belongs personally within the Church. But he knows also that the Church means suffering and not triumph.
— Karl Barth, The Epistle to the Romans