The Catholic's pocket prayer-book/Holy Mass, what it is
Appearance
HOLY MASS.
The Holy Mass is the sacrifice of the Body and Blood of Jesus Christ, which is offered to our heavenly Father on the altar under the appearances of bread and wine. It was instituted by Our Lord Himself in order to represent and continue that sacrifice which he made on the cross.
The best manner of hearing Mass is to offer it to God with the priest for the same purpose for which it is said, viz.: 1st, To honor and glorify God; 2d, To thank Him for all the graces bestowed on the whole world; 3d, To satisfy God's justice for the sins of men; 4th, To obtain all graces and blessings.
We should assist at Mass with great interior recollection and piety, and with every outward mark of respect and devotion.