Pentecost, let us not forget, came to a prayer meeting. Yes, in that Upper Room. And to those 120 Christians praying in one accord. There the Lord gave the standard, the pattern of Revival, indeed, the pattern for every church since Pentecost. Revival is not subtle - it is simple.
Revival truth is the plainest truth in Scripture.
All backsliding is from plain Scripture, not from all the prophetic mysteries we do not understand. The devil has decimated and all but devastated the prayer life of Christians and of their homes and of their churches. Many churches still don't have prayer meetings. And where they do, they usually are the weakest, most anemic of all the many meetings. I could go on and on.