We have heard this preached many times, but have never been shown a biblical proof. About the only Scripture we have ever heard is James 5:7, which says, 'Therefore be patient, brethren, until the coming of the Lord. See how the farmer waits for the precious fruit of the earth, waiting patiently for it until it receives the early and latter rain.' From our point of view, this seems to be reading a lot into this one verse. Perhaps someone else could provide some details on the scriptural evidence for a great end-time revival. We are certainly open to the idea.