The Canons of the Council in Trullo; Often Called The Quinisext Council 41Canon XLI.

Those who in town or in villages wish to go away into cloisters, and take heed for themselves apart, before they enter a monastery and practise the anchorite's life, should for the space of three years in the fear of God submit to the Superior of the house, and fulfil obedience in all things, as is right, thus shewing forth their choice of this life and that they embrace it willingly and with their whole hearts; they are then to be examined by the superior (proedros) of the place; and then to bear bravely outside the cloister one year more, so that their purpose may be fully manifested. For by this they will shew fully and perfectly that they are not catching at vain glory, but that they are pursuing the life of solitude because of its inherent beauty and honour. After the completion of such a period, if they remain in the same intention in their choice of the life, they are to be enclosed, and no longer is it lawful for them to go out of such a house when they so desire, unless they be induced to do so for the common advantage, or other pressing necessity urging on to death; and then only with the blessing of the bishop of that place.

And those who, without the above-mentioned causes, venture forth of their convents, are first of all to be shut up in the said convent even against their wills, and then are to cure themselves with fasting and other afflictions, knowing how it is written that "no one who has put his hand to the plough and has looked back, is fit for the kingdom of heaven."