John Francis Goggin,
Catholic Encyclopedia
(1913)
“ Among the liturgical functions, the celebration of Mass, or of the Holy Eucharist, occupies the most important place. Although the early writers speak in a guarded manner concerning these sacred mysteries, still they give much precious information on the liturgy of their age. The Mass seems to have been divided into the Mass of the catechumens, and the Mass of the faithful, and among the orthodox Christians the catechumens were rigidly excluded from assisting at the sacrifice proper. ”
