"ALSO [Jesus] told them a parable to the effect that they ought always to pray and not to turn coward (faint, lose heart, and give up)" (Luke 18:1)
All throughout the New Testament, Jesus encourages his disciples to pray persistently so that God's people would triumph over the evil of the coming days. God hears the persistent cries of His distressed people and when the proper time comes, He will swiftly and speedily come to justify them.
In Luke 18, Jesus speaks of a widowed woman who persistently goes to the town judge to request that she be vindicated from her enemies. The bible states that the judge, "did not fear God nor regard man." He was a wicked and arrogant individual who saw the widow as being a nuisance. Nevertheless, this did not deter her from consistently going to him. He was so exasperated by the widow's continual persistence that he eventually gave her the justice she was seeking.
If this judge, who is unjust, finally vindicated the widow woman; how much more will God who is just avenge the Christian man or woman who is persistent?
In another parable, a blind man sits by the side of the road, shamelessly begging and pleading for Jesus to have mercy on him. The local townsmen chastised him and tried to quiet him down but he cried out all the more. Then, Jesus said to him, "Receive your sight, your faith has made you well" (see Luke 18:35-43). Immediately, the blind man received his sight.
To feel shameless is to feel worthy enough to fight for a just cause. When one is shameless in their persistence, they are igniting a passion within them that cannot be easily quenched, no matter what the circumstances. Although it is likely that the widow woman and the blind man were the "talk of the town," God honored them in the presence of their enemies by giving them their due reward. However, it is important to note that their persistence did not come from a place of selfishness but from a pure and righteous heart. Thus, they had no shame and God greatly rewarded them.
Although it is not necessary for Christians to beg and plead with God for what they need, there is a faith that comes with shameless persistence that moves the heart of God. "The things that are impossible with men are possible with God." (Luke 18:27)