The great prince of the protestant pulpit of this century, Dr. Martyn Lloyd-Jones, issues forth the same warning. In his book, Revival , he takes a biblical and historical look at those things that hinder revival as well as those things that help to usher it in. He emphasizes that obedience to the Word of God was always present during times of great revival. However, when God's Word was ignored and neglected, there was great spiritual draught. The point is that faithfulness requires effort and discipline - a great deal of both.
Faithfulness is tough stuff.
Of course, we must pray. But what I am saying is that there is something we must do before we pray. There are certain preliminary conditions attached to prayer. The Bible from beginning to end makes it perfectly plain and clear that God can only be approached in certain ways, and on certain conditions. The Spirit who is poured out in revival is the same as the one who led the people to write the books of the Bible.