Jesus raises Lazarus from the dead, which leads some to believe and others to plot His death; He also heals ten men of leprosy, talks about when the kingdom of God will come and tells the parable of the persistent widow: John 11:36–57; Luke 17:11–18:8
Jesus taught more than once that we are to pray and keep on praying. Giving up wasn’t what he recommended.
To further illustrate His point, Jesus told the story of the widow (a powerless figure) who needed justice from an unjust judge:
Luke 18:2-5 A widow of that city came to [the judge] repeatedly, saying, ‘Give me justice in this dispute with my enemy.’ The judge ignored her for a while, but finally he said to himself, ‘I don’t fear God or care about people, but this woman is driving me crazy. I’m going to see that she gets justice, because she is wearing me out with her constant requests!’
Jesus’ suggestion was that we should learn from this:
Luke 18:2-8 … don’t you think God will surely give justice to his chosen people who cry out to him day and night? Will he keep putting them off? I tell you, he will grant justice to them quickly!
But there was a sting in the tail. It requires faith to pray and keep praying:
But when the Son of Man returns, how many will he find on the earth who have faith?