That remark shows that you do not understand the nature of Mass offerings at all. Priests do not sell Masses, and the people do not pay for Masses. The Mass cannot be bought or sold. Even were I to say that the Priest offers the Mass and is paid, not for the Mass, but for his time and services, any evil element such as you suggest would be excluded. It matters little whether a chaplain be given a salary for a year’s service, or a special offering for a special service. However the explanation is deeper than that. In rtie Old Law the people brought tithes and percentages of their goods and dedicated them to God. The gift was directly made to God, and once given, ceased to belong to the giver and belonged entirely to God. Then God made use of these gifts for the support of His religious ministers, inviting them to be His guests. The same spirit characterizes Catholic practice. A Catholic wishes to offer the Sacrifice of the Mass to God. He is not compelled to do so. Now the Mass is a Sacrifice instituted by Christ, but it supposes the outward necessities, bread, wine, altar, vestments, and a living human being authorized by God to offer it in the name of Christ and of the Church. The Catholic offers to God all that is necessary, and indeed offers a personal sacrifice by contributing towards the upkeep of the altar and towards the very life of the Priest who is to stand at the altar on his behalf. Since he has made this offering to God, the Mass is applied according to his intention. Thus, when you attack the idea that the Priest sells the Mass to a Catholic, you are not attacking Catholic doctrine or practice at all.
Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty