The office of doorkeeper explains itself, though it must be remembered that it was the special duty of the Christian ostiarius to exclude the unbaptized and persons undergoing penance from the more solemn part of the Eucharistic service.
In the last of these he maintains that children who die unbaptized must be lost, the pure soul being defiled by the grossness of the body, and declares that God's will is not to be questioned.
Missa or missio, because the children and catechumens, or unbaptized believers, were dismissed before the eucharistic rite began.
Following the fashion of the pagan mysteries in which men were only permitted to gaze upon the sacred objects after minute lustrations and scrupulous purifications, Christian teachers came to represent the Creed, Lord's Prayer and Lord's Supper as mysteries to be guarded in silence and never divulged either to the unbaptized or to the pagans.
On no account must they divulge it to unbaptized persons.