The desert ascetics of Egypt followed a three-step path to mysticism:
Purgatio,
Illuminatio, and
Unitio. These stages correspond to the
three ways of later Catholic theology. During the first level,
Purgatio (in Greek,
Catharsis), young monks struggled through prayer and
ascetic practices to gain control of "the flesh"—specifically by purging their gluttony, lust and desire for possessions. This period of purgation, which often took many years, was intended to teach young monks that whatever strength they had to resist these desires (
grace) came directly from the
Holy Spirit. At this point, the
Illuminatio (
theoria in Greek) commenced. During this period the monks practiced the paths to holiness as revealed in the Gospel, identifying strongly with the Christ who taught the
Sermon on the Mount (found in Matthew 5–7). Many monks took in visitors and students and tended the poor as much as their resources allowed. Many monks died never having moved past this period. The final stage was the
Unitio (
theosis in Greek), a period in which the soul of the monk was meant to bond with the Spirit of God in a union often described as the marriage of the
Song of Solomon (also called the "Song of Songs" or the "Canticle of Canticles"). To find the solitude and peace that this level of mystical awareness demanded, elderly monks often fled into the deep desert or into remote forests. His asceticism, while rigorous, was tempered by common sense. Cassian says hospitality should override ascetical routine. Even the most contemplative of anchorites should entertain visitors. Both asceticism and ministry are aspects of the practical life. and use of this formula became part of the
Liturgy of the Hours in the Western Church, in which all the
canonical hours, including the minor hours, start with this
versicle, which is omitted only if the hour begins with the
Invitatory, the introduction to the first hour said in the day, whether it be the Office of Readings or Morning Prayer.
Alphonsus Liguori also cites Cassian's recommendation to use this short prayer continually. In the West, Cassian's proposition that "the slightest glimmer of goodwill" could be attributed to the human drive was widely regarded as unacceptable in relation to the prosperity of the Augustinianism of the period (Conf. 13.7.1; cf Prosper of Aquitaine
Contra Collatorem; Cassiodorus,
Institutiones 1.29;
Decretum Gelasianum V.7
). In his
Thirteenth Conference and in writings to the Monks of Lerins, Cassian qualifies this by saying the good will is "stirred" by God: Cassian finds the will to be insufficient for spiritual progress, and traces this back to the initial sin of pride. Cassian illustrates advanced cases of the will's pathology in the
Institutions, saying these problems began when man "believed himself capable of attaining the glory of the Godhead by his
freedom of will and hard work." To this end, Cassian believes the renunciate must conquer his will, overcome it, and even kill it. In regards to demons, Cassian noted that the earliest coenobites would ensure one monk was reciting a prayer, psalmody, or reading at all times, due to their belief that demons were especially prevalent at night. Cassian promotes David's evil spirit repulsing prayer at Ps. 35: 1–3, for demons actively oppose the virtuous life, and could be warded off with prayer. ==Accusations of Semipelagianism==