The fundamental doctrine of Rome is that of salvation by sacraments.

This alone justifies its maxim, that "out of communion with the Church there is no salvation." The sacrament of Baptism regenerates the soul; the sacrament of Penance purifies it from mortal sin; the sacrament of the Eucharist renews its life; and that of Holy Orders qualifies the priest for administering these and the other sacraments.

But if the soul is saved by sacraments, duly administered and received, why go into a religious order to save the soul?
Why seek by special acts of piety, self-denial, and separation from the world that which comes sufficiently through the usual sacraments of the church?
The more we examine this subject, the more we shall see that the whole monastic system of the Church of Rome is an _included Protestantism_, or a Protestantism within the church.
Many of the reformers before the Reformation were monks.

Savonarola, St.
Bernard, Luther himself, were monks.

From the monasteries came many of the leaders of the Reformation.