Le Pelerinage de Lourdes §42

⁴² Only on condition of a return to regular reception of the sacraments, a regard for Christian morals in everyday life, entry into the ranks of Catholic Action and other apostolates recommended by the Church, can the great crowds expected to gather at Lourdes in 1958 yield - according to the expectations of the Immaculate Virgin herself - the fruits of salvation so necessary to mankind today.