It is easy to debate various aspects of Scriptural Revelation, brilliant minds have had major disagreements regarding the interpretation of scripture, and Biblical doctrine. But one thing is is difficult to debate is that God loves us and that he wants us to love "one another". That is pretty straight forward. If we do have questions about how to love, there are at least 35 direct commands given in scripture about how we are to treat "one another" well. 

Forgiveness is one of them, "forgive one another". Jesus makes forgiveness a part of this teaching on prayer, and it is the one part of the prayer that he actually included a footnote for emphasis. 

Hope you enjoy.