Hans Urs von Balthasar shares an eloquent reflection about a reality manifested in virtually all apostolate work, in volume four of his masterpiece, Explorations in Theology: Spirit and Institution.
“But if one conceded to the individual person—within all the psychological and sociological conditioning that forms a necessary part of being a member of a society coexisting in matter—a space of freedom, then something that has never been heard of before will always be happening with each personal expression. Using the conventional scaffolding of human, organic and social forms of expression, a person’s free expressions will open up a space to which there is no access whatever from without. This will therefore be a space that will take on the character of a miracle when set against one’s customary expectations derived from the law-like extrapolations of external behavior. Interior communication will always have something of the fascinosum about it. In the verbal gesture of language, and in every linguistic-expressive gesture as such, there will occur an irrevocable deed by virtue of which something that previously had not existed in the common world will come to be. What had previously been inaccessible—something that had perhaps existed in the inner core of the person for some time, or perhaps had only just occurred to that person himself in his decision to express it—has now become accessible for others (whether for one person or many) and been made available—given up, really—for their grasping.” (p. 212)