Mahmoud Shabestari: His most famous work is a mystic text called The Secret Rose Garden (Gulshan-i Rāz) written about 1311 in rhyming couplets (Mathnawi). This poem was written in response to fifteen queries concerning Sufi metaphysics posed to "the Sufi literati of Tabriz" by Rukh Al Din Amir Husayn Harawi (d. 1318).[6] It was also the main reference used by François Bernier when explaining Sufism to his European friends (in: Lettre sur le Quietisme des Indes; 1688)