Luk 18:7-8, 7 And shall God not avenge His own elect who cry out day and night to Him, though He bears long with them? 8 I tell you that He will avenge them speedily…
This is the application of the parable as the Lord said it, if an unjust, hard-hearted judge can be moved by the persistent prayers of a widow, will not the tender, loving, good Father hear the cries of His children?
And if we are unable to relate to this parable, we can journey back to Luke 11 of the example of a friend knocking on a friend’s door at midnight hour or a child asking for food from his father. Jesus says to the fathers listening to Him, Vs “13 If you then, being evil, know how to give good gifts to your children, how much more will your heavenly Father give the Holy Spirit to those who ask Him!”
The unjust judge regarded no man and ended up doing good. The earthy friend and father did good out of relations. Yet the 3 He would call evil people. God is so good that He gave His only begotten Son to save us, and even here, He would not withhold the Holy Spirit, the teacher, the guide, the comforter, the intercessor etc (Rom 8) if we ask. The note of the Holy Spirit is to indicate that there is nothing good from the smallest to the grandest that our good God would not do for His children. He has it all and is willing to give it to those who asks. The 3 had limitations, He is limitless. If persistence in prayer prevails over the rude and self-indulgent, what will it not achieve with the One who is “rich unto all that call upon Him!” He will give us just as much as we need.