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He decides to live in the Neapolitan slums, together with the Little Sisters of Charles de Foucauld, at the core of a network of voluntary groups of Christian origin that look at the Vatican Council II as a spiritual and civil source and inspiration.
He acted as a peritus (theologian advisor and consultant) during the Vatican Council II Second Vatican Council and was Provincial of the Society of Saint-Sulpice for Canada, Japan and Latin America from 1966 to 1970.