Work” (Opus Dei) or “Divine Office” came to be used in place of liturgy until the sixteenth century, when it was introduced into the Western Church’s vocabulary thanks to the influence of the Humanists. It was adopted by some churches of the Reformation in the seventeenth century, and introduced into Western Catholic literature in the eighteenth century by the first generation of liturgical scholars who used the term to talk of Christian sacraments. It was not until the pontificate of Gregory XVI