His major work, Audi, Filia, a classic of spirituality, is his most systematic treatise, wide-ranging and complete; its definitive edition was completed by the author in the last years of his life.
Praecipuum eius scriptum nempe Audi, filia, praestantissimum quidem opus traditum de spirituali doctrina, tractatus est potiore methodo, amplitudine ac perfectione digestus, cuius definitivam editionem postremis vitae annis ipse auctor curavit.vatican.va vatican.va