10. In connection with this matter it is of importance to consider that in the Eucharist, seeing that it was instituted by Christ as "a perpetual memorial of His Passion" (Opusc. Ivii. Offic. de festo Corporis Christi), is proclaimed to the Christian the necessity of a salutary self-chastisement. For Jesus said to those first priests of His: "Do this in memory of Me" (Luke xxii, 18); that is to say, do this for the commemoration of My pains, My sorrows, My grievous afflictions, My death upon the Cross. Wherefore this Sacrament is at the same time a Sacrifice, seasonable throughout the entire period of our penance; and it is likewise a standing exhortation to all manner of toil, and a solemn and severe rebuke to those carnal pleasures which some are not ashamed so highly to praise and extol: "As often as ye shall eat this bread, and drink this chalice, ye shall announce the death of the Lord, until He come" (1 Cor. xi., 26).