Nothing is greater or holier than the unbloody sacrifice of the Mass, in which the body and blood of Christ are offered to God for the salvation of all. Holy Mother the Church has always been careful and diligent in order that the Mass be celebrated by priests with clean and pure hearts. It should be celebrated with the proper splendor of sacred ceremonies and rites so that the greatness of this mystery will shine forth all the more even from external appearances. This will also arouse the faithful to the contemplation of divine things hidden in such an admirable and venerable sacrifice. And with like solicitude and devotion, the same most holy Mother has never ceased to urge, exhort, and influence her faithful sons to frequently attend this divine sacrifice with due piety, veneration and devotion. She teaches that they must at all cost be present at it on all holy days of obligation, with their minds and eyes religiously intent on that from which the divine mercy and an abundance of all good things might be acquired. (Bl. Pius IX AMANTISSIMI REDEMPTORIS).