What follows is an essay in case-study theology. The focus of the study is the doctrine and the experience of the Holy Spirit. The particular case through and by which this doctrine is studied is the missionary movement known as Pentecostal. The study began under missionary considerations. The late Dr. Hendrik Kraemer directed me during my course of studies at Princeton Theological Seminary to the University of Hamburg for missionary research. The late Professor D. Walter Freytag accepted
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