In Christianity today, the most frequently discussed issues are "salvation from sin" and "the indwelling of the Holy Spirit." However, few people have precise knowledge of these two ideas, despite the fact that they are the two most important concepts in Christianity. What is worse, we can't find any biblical writing that teaches us clearly about the issues above. There have been lots of Christian authors glorifying the gifts of the Holy Spirit or describing the Spirit-filled lives. But any of them doesn't dare to deal with the fundamental question, "How can a believer surely receive the...