On 28th May, 1902, Pope Leo XIII issued his Encyclical Letter Mirae Caritatis on the Holy Eucharist to the Patriarchs, Primates, Archbishops, Bishops, and other Local Ordinaries, having Peace and Communion with the Holy See:
"19. To conclude, we gladly acknowledge that it has been a cause of no small joy to us that during these last years a renewal of love and devotion towards the Sacrament of the Eucharist has, as it seems, begun to show itself in the hearts of the faithful; a fact which encourages us to hope for better times and a more favourable state of affairs. Many and varied, as we said at the commencement, are the expedients which an inventive piety has devised; and worthy of special mention are the confraternities instituted either with the object of carrying out the Eucharistic ritual with greater splendour, or for the perpetual adoration of the venerable Sacrament by day and night, or for the purpose of making reparation for the blasphemies and insults of which it is the object. But neither We nor you, Venerable Brethren, can allow ourselves to rest satisfied with what has hitherto been done; for there remain many things which must be further developed or begun anew, to the end that this most divine of gifts this greatest of mysteries, may be better understood and more worthily honoured and revered, even by those who already take their part in the religous services of the Church. Wherefore, works of this kind which have been already set on foot must be ever more zealously promoted; old undertakings must be revived wherever perchance they may have fallen into decay; for instance, Confraternities of the holy Eucharist, intercessory prayers before the blessed Sacrament exposed for the veneration of the faithful, solemn processions, devout visits to God's tabernacle, and other holy and salutary practices of some kind; nothing must be omitted which a prudent piety may suggest as suitable. But the chief aim of our efforts must be that the frequent reception of the Eucharist may be everywhere revived among Catholic peoples. For this is the lesson which is taught us by the example, already referred to, of the primitive Church, by the decrees of Councils, by the authority of the Fathers and of the holy men in all ages. For the soul, like the body, needs frequent nourishment; and the holy Eucharist provides that food which is best adapted to the support of its life. Accordingly all hostile prejudices, those vain fears to which so many yield, and their specious excuses from abstaining from the Eucharist, must be resolutely put aside; for there is question here of a gift than which none other can be more serviceable to the faithful people, either for the redeeming of time from the tyranny of anxious cares concerning perishable things, or for the renewal of the Christian spirit and perseverance therein. To this end the exhortations and example of all those who occupy a prominent position will powerfully contribute, but most especially the resourceful and diligent zeal of the clergy. For priests, to whom Christ our Redeemer entrusted the office of consecrating and dispensing the mystery of His Body and Blood, can assuredly make no better return for the honour which has been conferred upon them, than by promoting with all their might the glory of his Eucharist, and by inviting and drawing the hearts of men to the health-giving springs of this great Sacrament and Sacrifice, seconding hereby the longings of His most Sacred Heart."