In 1929, Balthasar attended a retreat for students in Wyhlen, Germany, and sensed what he believed to be a sudden call to follow Jesus Christ:"Even today [in 1959], after thirty years, I could still find again the tree on the lost path in the Black Forest, not far from Basel, under which I was struck as if by lightning.... [I]t was neither theology nor the priesthood that, at that moment, appeared in a flash before my mind; it was this alone: You have nothing to choose; you are called. You will not serve; another will use you. You have no plans to make; you are only a small little tile in a mosaic that has long been ready. I needed only to 'leave everything and follow,' without making plans, without wishes or ideas: I needed only to stand there and wait and see what I would be used for—and so it happened."He understood this experience as having been mediated by the figure of Ignatius of Loyola.