" If grace is God’s answer, the gift of Christian life, then we cannot for a moment dispense with following Christ. But if grace is the data for my Christian life, it means that I set out to live the Christian life in the world with all my sins justified beforehand. I can go and sin as much as I like, and rely on this grace to forgive me, for after all the world is justified in principle by grace. I can therefore cling to my bourgeois secular existence, and remain as I was before, but with the added assurance that the grace of God will cover me. It is under the influence of this kind of “grace” that the world has been made “Christian,” but at the cost of secularizing the Christian religion as never before. "
― Dietrich Bonhoeffer , The Cost of Discipleship