Psalms 85:6
The major theme of Christianity is life, and if Christianity is about life, there should be an understanding as to why are we talking about revival. Revival means to experience life again, and so, it is an important topic that should be discussed with believers. Revival is also about existing in Christ in an abundant way (1 Timothy 5:4-6).
There is a possibility of spiritual death even when the person is a believer. Death is in various dimensions (Rom.8:6; Rev.3:1). The lectures on revival is for God's people who have strayed, who have the reputation of being alive but are actually dead.