I read one book, off and on, while I was on retreat: Walking in the Spirit: A Reflection on Jeronimo Nadal's Phrase "Contemplative Likewise in Action" by Joseph F. Conwell, S.J. It's a combination history of the early Jesuits, biography of Jerome Nadal (who, while not one of the earliest of the Society, was a significant member and prolific writer in the years immediately preceeding and following the death of Ignatius) and treatise on prayer. I copied several sections into my journal, including the following:
"To insist on a Trinitarian orientation to prayer does not set limits on prayer but gives it a field of play broader than all creation. At the same time, fully Trinitarian prayer plants one's feet squarely on the earth. If a [person] grasps a Trinity-pervaded universe, then that grasp generates not merely a vision, a wonderment, an overwhelming gasp at the beauty and grandeur of it all; it initiates an immensely practical surging forward to meet and tangle with a world in revolt against that beauty and grandeur and love. Love born out of love moves to love."