2 In like manner we recalled Our Predecessor Pius X of holy memory, who, after ceaselessly promoting sacerdotal sanctity both by word and by example when he was keeping the fiftieth year from ordination to the priesthood, addressed a most pious "Exhortation to the Catholic Clergy," replete with precious and most choice lessons by which the edifice of the spiritual life is raised to no mean altitude.
Source: Mens Nostra (Vatican.va)