Council of Trent: Session XIII, Eucharist, Chapter V

CHAPTER V. On the cult and veneration to be shown to this most holy Sacrament.

Wherefore, there is no room left for doubt, that all the faithful of Christ may, according to the custom ever received in the Catholic Church, render in veneration the worship of latria, which is due to the true God, to this most holy sacrament. For not therefore is it the less to be adored on this account, that it was instituted by Christ, the Lord, in order to be received: for we believe that same God to be present therein, of whom the eternal Father, when introducing him into the world, says; And let all the angels of God adore him; whom the Magi falling down, adored; who, in fine, as the Scripture testifies, was adored by the apostles in Galilee.

The holy Synod declares, moreover, that very piously and religiously was this custom introduced into the Church, that this sublime and venerable sacrament be, with special veneration and solemnity, celebrated, every year, on a certain day, and that a festival; and that it be borne reverently and with honour in processions through the streets, and public places. For it is most just that there be certain appointed holy days, whereon all Christians may, with a special and unusual demonstration, testify that their minds are grateful and thankful to their common Lord and Redeemer for so ineffable and truly divine a benefit, whereby the victory and triumph of His death are represented. And so indeed did it behove victorious truth to celebrate a triumph over falsehood and heresy, that thus her adversaries, at the sight of so much splendour, and in the midst of so great joy of the universal Church, may either pine away weakened and broken; or, touched with shame and confounded, at length repent.

Translation: J. Waterworth, The Canons and Decrees of the Council of Trent (1848), Hanover Historical Texts Project transcription (1995).