Luke 18:4,5

(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.

It is on this point the Lord particularly lays the stress of the whole parable. Here is an unjust judge, one who is regardless both of God and man; fears not the one, nor loves the other; and yet, from the unceasing importunity and clamorous demands of a poor woman, determines in himself that he will do as she desired. From hence the Lord Jesus draws his unanswerable conclusion of the efficacy of prayer in the saints of God. It is as if the Lord Jesus had said, See what perseverance will do. Here's an unjust, unfeeling, time-serving wretch, at length over-ruled, overawed, and actually compelled to do a violence to his own feelings. I will (saith he) avenge her: not to save her, but to ease myself.