St. Benedict's Rule for Monasteries

Let the oratory be what it is called, a place of prayer; and let nothing else be done there or kept there. When the Work of God is ended, let all go out in perfect silence, and let reverence for God be observed, so that any brother who may wish to pray privately will not be hindered by another’s misconduct. And at other times also, if anyone should want to pray by himself, let him go in simply and pray, not in a loud voice but with tears and fervor of heart. He who does not say his prayers in this way, therefore, shall not be permitted to remain in the oratory when the Work of God is ended, lest another be hindered, as we have said.