'What love is, only Christ tells in his Word. Contrary to all my own opinions and convictions, Jesus Christ will tell me what love toward the brethren really is. Therefore spiritual love is bound solely to the Word of Jesus Christ. Where Christ bids me to maintain fellowship for the sake of love, I will maintain it. Where his truth enjoins me to dissolve a fellowship for love's sake, there I will dissolve it, despite all the protests of my human love.'
Dietrich Bonhoeffer, Life Together, p.22.