This introductory phrase, "mysterium fidei" in the Latin original, was previously translated loosely into English as "Let us proclaim the mystery of faith", and in some places was sung or spoken by the deacon instead of the priest in spite of the clear instruction in the Missal itself and in the apostolic constitution "Missale Romanum" with which Pope Paul VI promulgated the revision of the Roman Missal. The English translation was corrected in 2011 and now reads simply: "The mystery of faith".