40 Is it obligatory to participate at the Holy Mass? Christians have the obligation to participate at Mass every Sunday and on Feast Days established by the Church, unless there is a grave reason (such as sickness…). If these grave conditions are not present, then the Christian who does not fulfill this obligation commits a mortal sin. There is a triple duty on the Christian: towards God, towards oneself and towards the community. The Sunday Eucharist is a question of identity, in fact it is a requirement, a life-giving necessity from which we cannot turn. “We cannot live without Sunday” show the Christians of the 4th century who were martyred at Abitene in North Africa. 118