God gives us the ground in answer to the prayer of faith, but not the harvest. That must be worked for in co-operation with Him. Faith must be followed up by works, prayer works. Salvation is of grace, but it mustbe worked out (Phil 2:12) if it is to become ours. And the prayer of faith is just the same. It is given to us by free grace, but it will never be ours till we follow it up, work it out.
From the book "Mountain Rain: A New Biography of James O. Fraser"