Two Sisters in the Spirit explores the life and work of Thérèse of Lisieux and her near contemporary, Elizabeth of the Trinity. These giants of the Carmelite tradition, Balthasar shows, have complementary missions. Together, they represent the two fundamental goods so needed in the Church today: the good of existential appropriation of the faith (Thérèse) and the good of objective service to the point of forgetfulness of one’s own person (Elizabeth). In this way, Thérèse and Elizabeth illustrate the important truth that the diversity of charisms exists to serve and enrich ecclesial unity rather than undermining it.