He took my request kindly and asked me into his cell. " Come in," said he;… We went into his cell and he began to speak as follows. " The continuous interior Prayer of Jesus is a constant uninterrupted calling upon the divine Name of Jesus with the lips, in the spirit, in the heart; while forming a mental picture of His constant presence, and imploring His grace, during every occupation, at all times, in all places, even during sleep. The appeal is couched in these terms, Lord Jesus Christ, have mercy on me. One who accustoms himself to this appeal experiences as a result so deep a consolation and so great a need to offer the prayer always, that he can no longer live without it, and it will continue to voice itself within him of its own accord. Now do you understand what prayer without ceasing is!" (Emphasis added.)
“Yes indeed, Father, and in God’s name teach me how to gain the habit of it,” I cried, filled with joy.
He opened the book [The Philokalia], found the instruction by St. Simeon the New Theologian, and read: " Sit down alone and in silence. Lower your head, shut your eyes, breathe out gently and imagine yourself looking into your own heart. Carry your mind, i.e, your thoughts, from your head to your heart. As you breathe put, say Lord Jesus Christ, have mercy on me.’ Say it moving your lips gently, or simply say it in your mind. Try to put all other thoughts aside. Be calm, be patient, and repeat the process very frequently."
I listened closely and with great delight, fixed it in my memory, and tried as far as possible to remember every detail.