The day is one of the conditions that must be respected according to the liturgy, because those that are directly linked to salvation are ordered to be sanctified, and these dates are celebrated and cannot be replaced by other days. The interested party is also one of the requirements of the liturgy: several people or a single person, such as a priest or a religious, signify the prayer of the people, the liturgy, the prayer of the Church, for the people. Catechesis on Prayer in the Liturgy, in collaboration with Fr Jean Louis Rakotomanantsoa.