With the third volume, my Systematic Theology is completed. The last volume appears six years after the second volume, which itself appeared six years after the first one. The long periods between the dates of publication were caused not only by the qualitative and quantitative immensity of the subject but also by demands on my time in connection with my work as a systematic theologian. These demands involved developing particular problems in smaller and less technical books and presenting my views in lectures and discussions at many places in this country and abroad.