CATECHISM OF THE CATHOLIC CHURCH
SECOND EDITION

Paragraphs 2192–2196

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).
2193 "On Sundays and other holy days of obligation the faithful are bound . . . to abstain from those labors and business concerns which impede the worship to be rendered to God, the joy which is proper to the Lord's Day, or the proper relaxation of mind and body" (CIC, can. 1247).
2194 The institution of Sunday helps all "to be allowed sufficient rest and leisure to cultivate their familial, cultural, social, and religious lives" (GS 67 § 3).
2195 Every Christian should avoid making unnecessary demands on others that would hinder them from observing the Lord's Day.

Jesus said to his disciples: "Love one another even as I have loved you."

2196 In response to the question about the first of the commandments, Jesus says: "The first is, 'Hear, O Israel: The Lord our God, the Lord is one; and you shall love the Lord your God with all your heart, and with all your soul, and with all your mind, and with all your strength.' The second is this, 'You shall love your neighbor as yourself.' There is no other commandment greater than these."

The apostle St. Paul reminds us of this: "He who loves his neighbor has fulfilled the law. The commandments, 'You shall not commit adultery, You shall not kill, You shall not steal, You shall not covet,' and any other commandment, are summed up in this sentence, 'You shall love your neighbor as yourself.' Love does no wrong to a neighbor; therefore love is the fulfilling of the law."