The 4th Day is what a Cursillista lives after the 3 day weekend. Ultreya and Small Group Reunions help fortify us as we live the 4th Day, which has three essential ingredients: Piety, Study and Apostolic Action.
Piety is orienting the orientation of our life towards God. It involves anything that helps us develop a closer personal relationship with God and includes Mass, Prayer, the Sacraments, Meditation and Devotions, such as the Rosary.
Study is how we come to know God, His Church and ourselves as well as our His plan for us in the world.