The Holy Father is reported to have said in today’s General Audience:
“If you do not feel in need of God’s mercy, if you do not feel you are a sinner, then it’s better not to go to Mass, because we go to Mass because we are sinners and we want to receive the forgiveness of Jesus, to participate in His redemption, His forgiveness.”
Before you get too excited about this papal permission to skip Mass on Sunday, please recall the unchanged teaching of the Catholic Church:
2180 The precept of the Church specifies the law of the Lord more precisely: “On Sundays and other holy days of obligation the faithful are bound to participate in the Mass.”117 “The precept of participating in the Mass is satisfied by assistance at a Mass which is celebrated anywhere in a Catholic rite either on the holy day or on the evening of the preceding day.”118
2181 The Sunday Eucharist is the foundation and confirmation of all Christian practice. For this reason the faithful are obliged to participate in the Eucharist on days of obligation, unless excused for a serious reason (for example, illness, the care of infants) or dispensed by their own pastor.119 Those who deliberately fail in this obligation commit a grave sin.
2182 Participation in the communal celebration of the Sunday Eucharist is a testimony of belonging and of being faithful to Christ and to his Church. The faithful give witness by this to their communion in faith and charity. Together they testify to God’s holiness and their hope of salvation. They strengthen one another under the guidance of the Holy Spirit.
2183 “If because of lack of a sacred minister or for other grave cause participation in the celebration of the Eucharist is impossible, it is specially recommended that the faithful take part in the Liturgy of the Word if it is celebrated in the parish church or in another sacred place according to the prescriptions of the diocesan bishop, or engage in prayer for an appropriate amount of time personally or in a family or, as occasion offers, in groups of families.”120
2192 “Sunday . . . is to be observed as the foremost holy day of obligation in the universal Church” (CIC, can. 1246 § 1). “On Sundays and other holy days of obligation the faithful are bound to participate in the Mass” (CIC, can. 1247).
Furthermore, the Church teaches that deliberately skipping Mass is a mortal sin:
390. Is it a mortal sin not to hear Mass on a Sunday or a holyday of obligation?
A. It is a mortal sin not to hear Mass on a Sunday or a holyday of obligation, unless we are excused for a serious reason. They also commit a mortal sin who, having others under their charge, hinder them from hearing Mass, without a sufficient reason.
Is one excused from the Sunday obligation if he does not “feel the need of God’s mercy”? Absolutely not. Attending Mass on Sunday is an obligation that falls upon all Catholics, no matter how they happen to be feeling about God’s mercy. Indeed it is even more important to attend Mass if one doesn’t feel himself to be a sinner, or especially in need of God’s mercy, because the graces of the Mass can move a soul to contrition. Sinners have been converted at Mass by means of the homily, the readings, even the words of the liturgy itself – not to mention the presence of Christ and the prayers of the faithful. Catholics who don’t feel themselves to be in need of God’s mercy should be all the more encouraged to attend Sunday Mass, not to commit a mortal sin by staying home.