The Jesus Prayer draws its wording from two scriptural moments: the blind beggar who cries 'Son of David, have mercy on me,' and the tax collector of Jesus's own parable who says only, 'God, have mercy on me, a sinner.' Early Egyptian and Sinai monastics practiced short, repeated invocations of this kind as a way of obeying Paul's instruction to 'pray without ceasing,' and writers such as Diadochos of Photiki and John Climacus, in his Ladder of Divine Ascent, recommended binding the mind to a brief phrase rather than long discursive prayer. The wording stabilized gradually rather than appearing all at once, and it reached the form used today, naming Christ, Son of God, and asking mercy on a sinner, through the hesychast monks of Mount Athos in the fourteenth century.
Hesychasm, defended theologically by Gregory Palamas amid sharp controversy, tied the prayer to a broader claim about the possibility of directly experiencing divine light. Its most influential compilation came centuries later in the Philokalia, assembled in 1782 by Nikodemos of the Holy Mountain and Makarios of Corinth from earlier ascetic writers. The nineteenth-century Russian work The Way of a Pilgrim, presenting a wanderer learning the prayer from a spiritual father, carried the practice to a much wider readership, including well beyond Orthodox Christianity.