Meditations of a Desert Father (Christian Mystics)
If you really wish to achieve spiritual stillness
and to guard your heart successfully,
then let the prayer
“Lord Jesus, have mercy upon me”
become one with your breathing,
and in a few days you will see
how it can all be achieved.
~ Hesychios (6thC)
Hesychios is believed to have been a leader of a Sinai monastery in the 6th-7th century.