By far the strongest poison to the human spirit is the inability to forgive oneself or another person. Forgiveness is no longer an option but a necessity for healing.
The act of forgiveness is the act of returning to present time. And that's why when one has become a forgiving person, and has managed to let go of the past, what they've really done is they've shifted their relationship with time.
If we let go of things, our life is going to change. And the reality is that we are actually more afraid of change than we are of death.