John Cassian is probably the coolest person you didn’t know you knew. He is especially noted for his role in bringing the practices of Christian monasticism to the early medieval West. St. Benedict of Nursia praised some of John Cassian’s writing in his rule. Use of his formulation also became part of the Liturgy of the Hours! St. Alphonsus Ligouri, in his writing, cited Cassian’s recommendation to use this short prayer continually. Even the basic ideas put forth by St. Ignatius of Loyola can be attributed to John Cassian’s thought.
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