"The books of the Fathers, especially those which teach true obedience, vigilance of mind and silence, attention and mental prayer ( that is, prayer performed by the mind in the heart) are intended only for the monastic order and not for all Orthodox Christians in general. The God-fearing Fathers, in expounding the teachings on this prayer affirm that its beginning and unshakable foundation is true obedience, from which is born true humility; and humility guards him who who labours in prayer from all the delusions which dog the self-directed. But it is quite impossible for laypeople aqcuire true monastic obedience and perfect denial of the will and reason in everything. So how can laypeople, without obedience, by self-direction which is accompanied by delusion, force themselves to such terrifying work, that is, to prayer, without any kind of guidance? How will they be able to escape the diverse and varied illusions of the enemy most cunningly directed against this prayer and all who practise it?"