praying ground

In the image, above, the shadowy figure of a man is greatly disproportionate to the size of the buildings.  He seems to be walking through, and looking down upon, or brooding over, the city.  The surreal scene suggests, to my mind, a glimpse into the spiritual realm: in which the human figure portrays a man concerned for the city--towering above it, and praying for it.

In my mind, the above image represents me (as well as everyone else who is) praying for Revival, for cities and nations.  The question then arises, Can my prayer really make any difference in the life and future of a city, or even of a nation?  Although we may attempt to answer that question on principle, yet, in order to answer it in fact, a more fundamental question must first be answered, namely: Am I on praying ground? (Thanks, Dee C., for the phrase, "praying ground".)