Over the course of the Exhortation, current and concrete problems are dealt with: the family in today’s world, the education of children, marriage preparation, families in difficulty, and so on; these are treated with a hermeneutic that comes from the whole document which is the magisterial hermeneutic of the Church, always in continuity (without ruptures), yet always maturing. In this regard, in your letter you mentioned Saint Vincent of Lérins in his Commonitorium Primum: “ut annis scilicet consolidetur, dilatetur tempore, sublimetur aetate.” With respect to the problems that involve ethical situations, the Exhortation follows the classical doctrine of St. Thomas Aquinas. - Pope Francis, 1 August 2017.