A Catholic could not, when there is nothing to prevent his attendance at Mass. It is a mortal sin to miss Mass, and if he put himself into a state of mortal sin he vitiates all else he might attempt to do. That is, of course, unless he makes an act of perfect contrition, after which he could do some good actions; but he would not have fulfilled God’s essential law.
Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty