He was originally a Roman Catholic, but became Orthodox and lived in asceticism on the Holy Mountain as a monk. He was the spiritual father of St Gregory Palamas. His life was outwardly uneventful, and he reposed in peace in the 14th century. He left this very concise description of the hesychast's path: "Gather your mind and compel it to enter into your heart and remain there. When your mind is firmly in your heart, it must not remain empty, but must incessantly make the prayer: 'Lord Jesus Christ, Son of God, have mercy on me!' And it must never fall silent. Through this the whole string of the virtues: love, joy, peace and the others, will make their abode in you, by which, then, every request of yours to God will be fulfilled."