Spiritual gifts are one of the central themes of voluntary work. Globally the mobilization of lay people in the churches is based more and more on the spiritual gifts. Former Fuller Theological Seminary professor C. Peter Wagner has written unusually high number of studies and books which deal with spiritual gifts. He represents Neo-Charismatic Christianity and the so-called New Apostolic Reformation. What kind of structures and principles can be found in his thinking? What kinds of strengths and weaknesses does Wagner's understanding of spiritual gifts imply? What kind of relationship exists between spiritual gifts and church growth? How do Neo-Charismatic Christianity and the New Apostolic Reformation relate to the previous charismatic movements, such as the new Pentecostals and Classical Pentecostalism? These kinds of issues and also some others will be discussed in this study.