These two parables in Luke 18 (The Widow & the Unjust Judge and the Pharisee and the Tax-gatherer) deal with prayer. But the underlying theme is how we achieve justification.
saving faith
Parable of the Unforgiving Servant
The only solution to real guilt is real forgiveness. Forgiveness is a universal need of all humankind. Not only is forgiveness something we all need, forgiveness is also something we must give. But how?