To answer this question, Vox spoke to two experts: Robert Enright, a professor of education psychology at the University of Wisconsin Madison and a leader in the scientific study of forgiveness, and Laura Davis, the author of several books about estrangement and reconciliation, including The Burning Light of Two Stars: A Mother-Daughter Story. Both have worked extensively with people who have experienced serious personal injustice, including survivors of child sexual abuse and gender-based violence. Enright and Davis say that forgiving someone who is unrepentant is absolutely possible; here’s how to approach it.