I hesitate to comment on this subject because it is just so huge. Prayer that moves God is not memorized, categorized, defined, liturgized, or read. It is the unction of a believer to God. It is a Holy moaning of the inner soul. It is encrypted to be understood only by one's Savior. Without prayer, our soul dries up and shrivels. With prayer, new freshness, life, and vitality enters and changes things, rewrites history, moves mountains.