A thought from Bishop Conlon in his sermon on Corpus Christi. Sunday Mass is not to be seen as an obligation. Rather see Sunday Mass as a way to sanctify your week. Sunday Mass is a gift from God to help us in many ways.
One can view Sunday Mass as the beginning of one’s week, but also as the ending of the week (especially if one goes to the vigil Mass on Saturday). As the end of the week, we can thank God for all that He has provided for us during the week, even the problems. As the beginning of the week, we can ask God to sanctify it for us so that we can best do our work, live our lives as witness to His love.
The Church still sees Sunday Mass as an obligation. It is that necessary for our spiritual lives. Think of those parts of life that hold obligations. People are obligated to take medications. They can choose not to, but to the detriment of their health and even to their lives. Sometimes we just have to do it.