The Endurance of Prayer:

Luke 18:1-8 KJV

[1] And he spake a parable unto them to this end, that men ought always to pray, and not to faint; [2] Saying, There was in a city a judge, which feared not God, neither regarded man: [3] And there was a widow in that city; and she came unto him, saying, Avenge me of mine adversary. [4] And he would not for a while: but afterward he said within himself, Though I fear not God, nor regard man; [5] Yet because this widow troubleth me, I will avenge her, lest by her continual coming she weary me. [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?