This infographic presents the Jesus Prayer with an explanation of the meaning of its words from the Catholic Catechism. While this ancient prayer is often associated with the Orthodox and Eastern Catholic churches, it is also a thoroughly "Catholic" prayer.
The discipline of repeating words of scripture is rooted in the Desert Fathers. It was promoted by St. John Cassian around 400 A.D. This daily discipline is alive today among the Orthodox and Eastern Catholics and the Centering Prayer movement.
A good source of information on The Jesus Prayer can be found at Orthodox Prayer.