The moral of the story:
Related Commentaries of Luke 18:6
Luke 18:6-8
6 And the Lord said, Hear what the unjust judge saith.
7 And shall not God avenge his own elect, which cry day and night unto him, though he bear long with them?
8 I tell you that he will avenge them speedily. Nevertheless when the Son of man cometh, shall he find faith on the earth?