As powerful as city-wide and mass crusades are, there can be no revival unless the church returns to personal (one-on-one) evangelism.

Personal evangelism has been tested over the years to be far more effective than mass crusades.

Mass crusade is like keeping several empty bottles outside while it's raining for them to get filled. That would be a difficult task. The heavy rain will cause an erosion while the bottles may never get full. Even if anyone gets full, it stands the risk of spilling its content.

But personal evangelism is like taking a container of water and pouring it directly into the bottles, one at a time. By this way, more bottles will get filled within a shorter time and lots of resources will be preserved.