From the "Synaxarion of the Lenten Triodion and Pentecostarion", HDM Press.
Saints Peter and Paul Bulletin, April 6, 2003
On this day, the fourth Sunday of Great Lent, we commemorate our venerable Father among the saints, St. John of Sinai, the author of The Ladder of Divine Ascent.
No one knows the birthplace or parentage of our venerable Father John of Sinai. In his youth, at the age of sixteen, he came to the wilderness of Sinai and dwelt under the guidance of Abba Martyrius. When Abba Martyrius tonsured our venerable Father John at the age of twenty, he took him and went to that pillar of the wilderness, Abba John the Sabbaite in the wilderness of Gouda where he had with him his disciple Stephen the Cappadocian. When the Sabbaite elder saw them, he arose and took water, poured it into a small basin, washed the feet of the disciple (the young John) and kissed his hand; but did not wash the feet of Abba Martyrius his superior. Abba Stephen was scandalized by the situation. After the departure of Abba Martyrius and his disciple, Abba John noticed that his own disciple was greatly perplexed and said to him, “Why are you so troubled? Believe me, I do not know who the boy is, but today I received the abbot of Sinai and washed his feet.” After forty years, he did indeed become the abbot according to the prophecy of the elder.