... The soul's true peace lies in the gentle name of Jesus and in its emptying itself of impassioned thoughts.
("Philokalia (Vol. 1)", p. 183, text 122)
Attentiveness is the heart's stillness, unbroken by any thought. In this stillness the heart breathes and invokes, endlessly and without ceasing, only Jesus Christ who is the Son of God and Himself God. It confesses Him who alone has power to forgive our sins, and with His aid it courageously faces its enemies...
("Philokalia (Vol. 1)", p. 163, text 5)
If you really wish to cover your evil thoughts with shame, to be still and calm, and to watch over your heart without hindrance, let the Jesus Prayer cleave to your breath, and in a few days you will find that this is possible.
("Philokalia (Vol. 1)", pp. 194-195, text 182)