3 “There was a widow in that city, and she kept coming to him, saying, ‘Give me legal protection from my opponent.’
4 “For a while he was unwilling; but afterward he said to himself, ‘Even though I do not fear God nor respect man,
5 yet because this widow bothers me, I will give her legal protection, otherwise by continually coming she will wear me out.'”
6 And the Lord said, “Hear what the unrighteous judge said;
7 now, will not God bring about justice for His elect who cry to Him day and night, and will He delay long over them?
8 “I tell you that He will bring about justice for them quickly. However, when the Son of Man comes, will He find faith on the earth?” Luke 18:1-8.
There was not a clear reference to anything righteous in the two main characters of this prayer parable. The judge was directly described as unrighteous, and the widow was just demanding with nothing disclosed that tugs at our heart that she was righteous or otherwise entitled. This simple setting focuses on the importance of persistence in prayer. We are encouraged by the question and statement: “… will not God bring about justice for His elect who cry to Him day and night, and will He delay long over them? I tell you that He will bring about justice for them quickly.”
But, there is a puzzling conclusion. “However, when the Son of Man comes, will He find faith on the earth?”
I am sure that there a lot of good interpretations and commentaries on the purpose of this conclusion. You can look them up. But, for me, James 1:5-8 pops up: “But if any of you lacks wisdom, let him ask of God, who gives to all generously and without reproach, and it will be given to him. But he must ask in faith without any doubting, for the one who doubts is like the surf of the sea, driven and tossed by the wind. For that man ought not to expect that he will receive anything from the Lord, being a double-minded man, unstable in all his ways.” (Emphasis added.)
Reformed Doctrine Daily Devotions 