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The form most in use on [[Mount Athos]] is "[[Lord]] Jesus Christ, Son of God, have mercy on me." It is particularly used in the practice of the spiritual life known as [[hesychasm]].
It is, for the Orthodox, one of the most profound and mystical prayers and is often repeated endlessly as part of a personal [[asceticism|ascetic]] practice. There have been a number of [[Roman Catholic Church|Roman Catholic]] texts on the subject, but its usage has never achieved the same degree of devotion as in the Eastern Church. A more elaborate version known to some Roman Catholics by the same name goes: "O my Jesus, forgive us our sins, save us from the fires of Hell, and lead all souls to Heaven, especially those most in need of Your mercy."
The prayer is most reflective of the lesson taught by the [[parable]] of the [[Publican and the Pharisee]]; in which the [[Pharisee]] demonstrates the improper way to pray by exclaiming, "Thank you Lord that I am not like the Publican." While the Publican in humility prays correctly "Lord have mercy on me, the sinner" ([[Gospel of Luke|Luke]] 18:10-14). And likewise in the [[Gospel]]s, [[Apostle Peter|Peter]] crying out as he sank into the sea, "Lord, save me."