A group of theologians collaborated to publish a commentary on the Encyclical letter Haurietis Aquas. Among these were brothers Hugo and Karl Rahner. Their contribution is a theological reflection on the veneration of the Sacred Heart of Jesus, an example of a rich connection between spiritual reality and theological thought before the Second Vatican Council. In this case we see a remote theological preparation of the Council and an important theological work which was later developed by the Council itself. All (...) this was happening around the time when the Institute of Spirituality at the Gregorian University was founded. (shrink)