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If we struggle with love/forgiveness of others, it could be said that this rigidity stems from our own dishonest ungrateful hearts as this attitude emanates from self-righteousness, as possibly we underestimated the generosity of Jesus Christ in our own personal salvation; as to attempt to embrace our Father in the Truth of His Inviolate Word (Will) can only be done in humility (St Bernard-Humility a virtue by which a man knowing himself as he truly is, abases himself). 
A faith that does not embody this consistent realization (Need of His mercy) will be sterile, comparable a stylus stuck in the grove of a record as the heart will not hear/absorb the full transforming message of Spiritual enlightenment that is the on going transformation of the human heart. 
I know this from personal experience because my own heart was stuck in a grove over many years