1. The context

Once, on being asked by the Pharisees when the kingdom of God would come, Jesus replied, “The coming of the kingdom of God is not something that can be observed, nor will people say, ‘Here it is,’ or ‘There it is,’ because the kingdom of God is in your midst.” Luke 17:20-21

Just as it was in the days of Noah, so also will it be in the days of the Son of Man. People were eating, drinking, marrying and being given in marriage up to the day Noah entered the ark. Then the flood came and destroyed them all. It was the same in the days of Lot. People were eating and drinking, buying and selling, planting and building. But the day Lot left Sodom, fire and sulfur rained down from heaven and destroyed them all. Luke 17:26-29

2. The culture

Then Jesus told his disciples a parable to show them that they should always pray and not give up. He said: “In a certain town there was a judge who neither feared God nor cared what people thought. And there was a widow in that town who kept coming to him with the plea, ‘Grant me justice against my adversary.’ Luke 18:1-3

3. The content

For some time he refused. But finally he said to himself, “Even though I don’t fear God or care what people think, yet because this widow keeps bothering me, I will see that she gets justice, so that she won’t eventually come and attack me!” Luke 18:4-5

4. The comparison

And the Lord said, “Listen to what the unjust judge says.” And will not God bring about justice for his chosen ones, who cry out to him day and night? Will he keep putting them off?
Luke 18:6-7

5. The conclusion

I tell you, he will see that they get justice, and quickly. However, when the Son of Man comes, will he find faith on the earth? Luke 18:8

6. Connecting teaching about prayer

As for me, I call to God, and the Lord saves me. Evening, morning and noon I cry out in distress, and he hears my voice. Psalm 55:16-17
Do not be anxious about anything, but in every situation, by prayer and petition, with thanksgiving, present your requests to God. And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus. Philippians 4:6-7

And when you pray, do not keep on babbling like pagans, for they think they will be heard because of their many words. Do not be like them, for your Father knows what you need before you ask him. This, then, is how you should pray: ‘Our Father in heaven, hallowed be your name, your kingdom come, your will be done, on earth as it is in heaven. Give us today our daily bread. Matthew 6:7-11

The end of all things is near. Therefore be alert and of sober mind so that you may pray. 1 Peter 4:7

Humble yourselves, therefore, under God’s mighty hand, that he may lift you up in due time. Cast all your anxiety on him because he cares for you. 1 Peter 5:6-7

But when you ask, you must believe and not doubt, because the one who doubts is like a wave of the sea, blown and tossed by the wind. That person should not expect to receive anything from the Lord. James 1:6-7
Rejoice always, pray continually, give thanks in all circumstances; for this is God’s will for you in Christ Jesus. 1 Thessalonians 5:16-18
I write these things to you who believe in the name of the Son of God so that you may know that you have eternal life. This is the confidence we have in approaching God: that if we ask anything according to his will, he hears us. And if we know that he hears us—whatever we ask—we know that we have what we asked of him. 1 John 5:13-15