For the theologian, approaching the question of the sensus fidelium means entering a field of research of which many sectors are still unexplored. And yet, today, as at the time when Newman wrote his famous article On Consulting the Faithful in The Rambler of July 1859, the problem counts among the most important ones, both at the level of theological research on the very nature of the Church and at the level of the concrete relationships between the hierarchy (with its function of “magisterium”) and the body of the faithful. I shall give merely a few indications of this.