St. Nikodemus of the Holy Mountain or St. Nikodemus the Hagiorite (1749 – 1809) – was a monk, mystic, theologian, and philosopher. His life’s work was a revival of traditional Christian practices and patristic literature. He wrote ascetic prayer literature and influenced the rediscovery of Hesychasm. He is most famous for his work with St. Macarius of Corinth on The Philokalia.
“…it is the duty of all Christians, small and great, always to practice the mental prayer Lord Jesus Christ, have mercy on me, so that their mind and heart may acquire the habit of always uttering those holy words. Let this convince you how pleasing this is to God and what great good derives from it, since He, out of His infinite love for men, sent a heavenly Angel to tell us this, so that no one should have any doubt about it.”
~ From The Life of St. Gregory Palamas, Archbishop of Thessalonica, the Wonderworker, by St. Nikodemos of the Holy Mountain