I think that to forgive deeply, we need humility. How would you define humility?
Although Aristotle did not explicitly use the word humility, philosophers following in the Aristotelian tradition have seen humility as a moral virtue between the vices of dogmatism or arrogance on the one hand and timidity or moral weakness on the other (Hazlett, 2012). In other words, humility is a quest for truth about the self and others that avoids extremes.
Hazlett, A. (2012). Higher-order epistemic attitudes and intellectual humility. Episteme, 9, 205–223.