Jesus Prayer Unites Mind and Heart
"All your inner disorder is due to the dislocation of your powers, the mind and the heart each going their own way. You must unite the mind with the heart: then the tumult of your thoughts will cease, and you will acquire a rudder to guide the ship of your soul, a lever with which to put all your inner world in movement. How can this union be achieved? Make it your habit to pray these words with the mind in the heart: 'Lord Jesus Christ, Son of God, have mercy upon me'. And this prayer, when you have learnt to use it properly, or rather, when it becomes grafted to the heart, will you to the end which you desire: it will unite your mind with your heart, it will quell the turbulence of your thoughts, and it will give you power to govern the movements of your soul."
- St. Theophan the Recluse. "Concentrated within yourself." The Art of Prayer: An Orthodox Anthology, Timothy Ware, ed., Faber and Faber, 1966, p. 195.