1 And he spake a parable unto them to the end that they ought always to pray, and not to faint; 2 saying, There was in a city a judge, who feared not God, and regarded not man: 3 and there was a widow in that city; and she came oft 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 she wear me out by her continual coming. 6 And the Lord said, Hear what the unrighteous judge saith. 7 And shall not God avenge his elect, that cry to him day and night, and _yet_ he is longsuffering over them? 8 I say unto you, that he will avenge them speedily. Nevertheless, when the Son of man cometh, shall he find faith on the earth?

The parable of the Unrighteous Judge was spoken in direct connection with the instructions given to the disciples by their Master in reference to his return. It is, therefore, not merely a general exhortation to prayer, but to prayer for the coming of Christ, and more specifically to the confident expectation of this event and of the blessedness which will result.

The Gospel of Luke, An Exposition — Part 122

It does, however, contain a very real encouragement to prayer and for all Christians and at all times. The argument is this: If an unjust judge, who has regard for neither God nor man, would yield to the importunity of an unknown widow because he feared that she would annoy him by her repeated requests, how much more will a just God be ready to reward the persevering petitions of his own loved ones who cry to him continually!

The Gospel of Luke, An Exposition — Part 122

In spite of all the mysteries involved, the followers of Christ should pray without ceasing, and with all importunity should present their petitions with the assurance that God does hear and in his own time will answer.

The Gospel of Luke, An Exposition — Part 122

The particular force of the parable relates, however, to the Church in her conscious weakness and loneliness, in the age between the crucifixion and the second coming of Christ. Jesus had just given a description of the world at the time of his return. He had pictured the prevalent carelessness and indifference and absorption in earthly pursuits, and now he wished to encourage his followers to be patient and to turn their hearts toward him in expectation and prayer. The widow in the parable is not so much requesting that an enemy should be punished as that she should be given her property rights for which she is applying to the judge. So the Church is pictured, not simply as crying for vengeance upon persecutors, but rather as longing and praying for all those blessings which have been promised and which will be received at the coming of the Lord.