Always pray and not lost heart

Luke 18:1-14
Ought always pray and not lost heart. Will not God give justice to his elect,, who cry to him day and night? Will he delay long over them? I tell you, he will give justice to them speedily.
When Son of Man comes, will he find faith on earth?
The prayer of Pharisee and the tax collector. Tax collector is more humble and confessed his sins. He is more justified and the Pharisee.
For everyone who exalts himself will be humbled, but the one who humbles himself will be exalted.
Why?
God is not like the unjust judge. If this woman can persist with her plea, winning justice against such odds, how much more confident of a hearing and of justice can God's chosen ones' be. They need to pray and not lost heart, even if the answer is delayed.
The Pharisee 'prays' simple to congratulate himself on being better than others, and to rehearse his good deeds. It is the ta collector - the one who finds nothing in himself to be proud of whom God hears.
Yes, God is listen our prayer for we are his chosen one.
How?
My prayer and my heart does not have faith enough, please  give me the faith O Lord!