Most Masses are settings of the liturgy in Latin but there are a significant number written in the languages of non-Catholic countries where vernacular worship has long been the norm .
Latin is the liturgical sacred language of the Catholic Church 's Roman liturgy .
Most Masses are settings of the liturgy in Latin , the liturgical sacred language of the Catholic Church 's Roman liturgy , but there are a significant number written in the languages of non-Catholic countries where vernacular worship has long been the norm .