Dietrich Bonhoeffer on the Nicene anathemas, Gesammelte Schriften 3, Theologie, Gemeinde: Vorlesungen, Briefe, Gespräche, 1927 bis 1944 (München: Chr. Kaiser, 1960), 206, as quoted by Bertrand de Margerie, S.J., in The Christian Trinity in history, trans. Edmund J. Fortman, S.J., Studies in historical theology 1 (Still River, MA: St. Bede’s Publications, 1982), 98. This appears in DBWE 12 as
For us the concept of heresy no longer exists, because there is no longer a doctrinal authority vested in councils. Our ecumenical councils of today are anything but councils, because the word heresy has been struck from our vocabulary. And yet the concept of heresy is a necessary, nonnegotiable factor for the confessing church. Doctrine must always be set over against false doctrine; otherwise one does not know what doctrine means. However, care must be taken that the concept of heresy be one that is used by the church out of love, not out of lack of love. For if I do not speak the truth to my brethren, I am considering them as heathens; if I do speak the truth to them, I am doing it out of love.Lectures on Christology (student notes), Summer 1933, Berlin: 1932-1933, ed. Larry L. Rasmussen, trans. Isabel Best & David Higgins, Dietrich Bonhoeffer Works 12 (Minneapolis: Fortress Press, 2009), 332 =Dietrich Bonhoeffer Werke, ed. Carsten Nicolaisen & Ernst-Albrecht Scharffenorth, Dietrich Bonhoeffer Werke 12 (München: Chr. Kaiser Verlag, 1997), 316.