The language and signs used in the liturgy are very specific. If a national language is used, the translation must have been approved by the Vatican. The books used in the liturgy are either the Bible, the Book of Mass, books on the Sacraments or sacramentals and these special anointings must have been approved by the Church. Catechesis on Prayer in the Liturgy, in collaboration with Fr Jean Louis Rakotomanantsoa.