If you wish to read the texts click on the texts: 3 Jn 5-8; Lk 18:1-8
This is a parable found only in the Gospel of Luke. While some focus on the judge and term it as the Parable of the Unjust Judge, others focus on the widow and so call it the Parable of the Persistent Widow. Luke introduces this parable as a parable on prayer. The judge is described as a man “who neither feared God nor had any respect for people” (18:2). It is difficult to imagine how such a man can be worthy of being a judge. The widow is introduced as someone who is going repeatedly to the judge for justice. The text does not state the nature of her complaint, nor does it tell us why the judge refused to listen to her for a while (18:3-4). The judge finally relents and decides to grant her justice, because the woman is constantly bothering her and because he does not want to be worn out by her constant petitions.
If one focuses on the judge, then the point of the parable is that if the judge who was unjust could grant the woman justice, then God who is just and judge over all will surely heed the cries of those who call on him.
If on the other hand the focus is on the widow, then the parable calls for persistence in asking and not giving up or giving in.
The final verse of this section ends with a question from the Lucan Jesus about whether he will find faith on earth when he comes. Since Luke introduces the parable as one, which speaks about persistence and constant asking, he may have felt the need to end with the question of faith.
Prayer can and does “change” the mind of God.