Henry Corbin’s work was devoted to illustrating deep connections between the mystical traditions within Christianity and Islam and Judaism. He thought of this as similar to the attempts of early Christians to reconcile the stories in the four Gospels: Matthew, Mark, Luke and John. The traditional name for the underlying unity of the Gospels is the Harmonia evangelica. Corbin thought that Judaism, Christianity & Islam were all united by an underlying Harmonia Abrahamica: the harmony of the religions of Abraham.