18:1 Then Jesus told them a parable about their need to pray always and not to lose heart.
18:2 He said, “In a certain city there was a judge who neither feared God nor had respect for people.
18:3 In that city there was a widow who kept coming to him and saying, ‘Grant me justice against my opponent.’
18:4 For a while he refused; but later he said to himself, ‘Though I have no fear of God and no respect for anyone,
18:5 yet because this widow keeps bothering me, I will grant her justice, so that she may not wear me out by continually coming.'”
18:6 And the Lord said, “Listen to what the unjust judge says.
18:7 And will not God grant justice to his chosen ones who cry to him day and night? Will he delay long in helping them?
18:8 I tell you, he will quickly grant justice to them. And yet, when the Son of Man comes, will he find faith on earth?”
Sadhu Sundar Singh
Both water and oil come from the earth. And though they are similar in many ways, they are opposites in their nature and their purpose. One extinguishes fire, the other gives fuel to the fire. Similarly, the world and its treasures are creations of God along with the soul and its thirst for spiritual truth. But if we try to quench the thirst of our soul with the wealth and pride and honors of this world, then it is like trying to extinguish fire with oil.
Source: Wisdom of the Sadhu