My copy of this essay is chapter 9 in Church, Ecumenism, & Politics: New Endeavors in Ecclesiology (San Francisco: Ignatius, 2008). This volume consists of a number of essays from a broad span of time, from 1972 to 1989.
This particular essay was originally published as “Das Gewissen in der Zeit: Ein Vortrag vor der Reinhold-Schneider-Gesellschaft”, Internazionale katholische Zeitschrift Communio I (1972): 432-42, and reprinted in Reinhold-Schneider-Gesellschaft e.V. 4 (July 1972): 13-29.