“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. Through this invocation enfolded continually in Christ, who secretly divines all hearts, the soul does everything it can to keep its sweetness and its inner struggle hidden from men, so that the devil, coming upon it surreptitiously, does not lead it into evil and destroy its precious work.”
- Saint Hesychios the Priest