We know little about revival because few people now living have ever seen a revival. We have not witnessed a great visitation from above–God coming down in a mighty move before which multitudes are moved like wheat fields before a summer wind. There have been such times as in the days of Wesley and the American awakenings. There have been local revivals in churches and on college campuses, but, except for a few survivors of the Welsh or Shantung revivals or similar visitations, all we know about it is secondhand.