The Secret Gospel of Mark or the Mystic Gospel of Mark, also the Longer Gospel of Mark, is a putative longer and secret or mystic version of the Gospel of Mark. The gospel is mentioned exclusively in the Mar Saba letter, a document of disputed authenticity, which is said to have been written by Clement of Alexandria. This letter, in turn, is preserved only in photographs of a Greek handwritten copy seemingly transcribed in the 18th century into the endpapers of a 17th-century printed edition of the works of Ignatius of Antioch. Some scholars suggest that the letter implies that Jesus was involved in homosexual activity, although this interpretation is contested.
The ancient Mar Saba monastery, c. 1900. At the top right is the Northern Tower harbouring the Tower Library, where Morton Smith in 1958 discovered the Vossius book with the inscribed letter of Clement.
The Greek Orthodox Patriarch Benedict I of Jerusalem, who gave Morton Smith "permission to spend three weeks at Mar Saba [to] study the manuscripts there".
Page two of Clement's letter to Theodore. The longer quotation from the Secret Gospel of Mark begins on the fourth row from the bottom with καὶ ἔρχονται εἰς βηθανίαν (and they come into Bethany). The actual size of the page is 198 x 148 mm, 7.8 x 5.8 in.
The American professor of ancient history, Morton Smith, teaching a graduate seminar on Paul at Columbia University in 1989
The Mar Saba letter is a Greek document which scholar Morton Smith reported in 1960 that he had discovered in the library of the Mar Saba monastery in 1958. The document has been lost and now only survives in two sets of photographs. The text purports to be an epistle of Clement of Alexandria and contains the only known references to a "Secret Gospel of Mark".
Mar Saba letter
Mar Saba monastery