Non-forgiveness is often toward another person or yourself, but it may just as well be toward any situation or condition - past, present or future - that your mind refuses to accept. Yes, there can be non-forgiveness even with regard to the future. This is the mind's refusal to accept uncertainty, to accept that the future is ultimately beyond its control. Forgiveness is to relinquish your grievance and so to let go of grief. It happens naturally once you realize that your grievance serves no purpose except to strengthen a false sense of self. Forgiveness is to offer no resistance to life - to allow life to live through you.
— Eckhart Tolle