Luke 18:1 NKJV Then He spoke a parable to them, that men always ought to pray and not lose heart, 2 saying: "There was in a certain city a judge who did not fear God nor regard man. 3 "Now there was a widow in that city; and she came to him, saying, ‘Get justice for me from my adversary.’ 4 "And he would not for a while; but afterward he said within himself, ‘Though I do not fear God nor regard man, 5 ‘yet because this widow troubles me I will avenge her, lest by her continual coming she weary me.’" 6 Then the Lord said, "Hear what the unjust judge said. 7 "And shall God not avenge His own elect who cry out day and night to Him, though He bears long with them? 8 "I tell you that He will avenge them speedily. Nevertheless, when the Son of Man comes, will He really find faith on the earth?"
The parable encourages us to be importunate in our prayers.
The parable presupposes that prayer is being made because we are suffering affliction.
A Christian must not fight or avenge themselves but leave retribution in the hands of God.
Romans 12:19 NKJV Beloved, never avenge yourselves, but leave room for the wrath of God; for it is written, "Vengeance is mine, I will repay, says the Lord."
Judgment generally is deferred to the return of Christ.
Acts 17:31 NKJV "because He has appointed a day on which He will judge the world in righteousness by the Man whom He has ordained. He has given assurance of this to all by raising Him from the dead."
All judgment will be administered by Jesus Christ and will be in accordance with his commandments as laid out in the New Testament.
John 5:22 NKJV "For the Father judges no one, but has committed all judgment to the Son,
John 12:48 NKJV "He who rejects Me, and does not receive My words, has that which judges him—the word that I have spoken will judge him in the last day.
I hope you find this helpful.