Prayer is a Mystery, though not something that is incomprehensible if we understand how it WORKS. Prayer is the greatest tool given to a true believer in Jesus Christ to get things done on the earth. Having the key to a brand new car doesn't guarantee that the car will carry you to your destination, you have to know how to drive the car before you can use the key. The same principle applies to Prayer Knowing that Prayer Works is not enough, You have to know HOW it WORKS in order to enjoy its benefits.