Jim Cymbala's book, "Fresh Wind, Fresh Fire" is a good reminder why we must continue to pray until revival comes. In the book, he wrote how persistent prayer brought back his daughter Chrissy from a wayward life. He writes:
"Through all this, (my wife) Carol and I learned as never before that persistent calling upon the Lord breaks through every stronghold of the devil, for nothing is impossible with God. For Christians in these troubled times, there is simply no other way" (p. 66).
There really is no other way for the Kingdom of God to advance around us unless we consistently cry out to the Lord.
Have a great day