Quemadmodum §7

⁷ We firmly trust that, as in Apostolic times, when the Christian population of Jerusalem was subjected to poverty and persecution, the rest of the faithful throughout the world contributed their prayers and material aid. (Cf. I Cor . 16,1) so now, too, all will be inspired and animated by the same charity and will help as much as they can. This they should do, as We have said, especially by fervent prayer to our most merciful Redeemer. For, as you know, fervent prayer carries with it a mystic power that penetrates Heaven and calls down supernatural light and Divine impulses to illumine men's minds and incline their wills to good, to persuade and move them to charity.