Makhzan ol-Asrar or Makhzan al-Asrar (Persian: مخزن‌الاسرار, means: The Treasury of Mysteries) is the title of a famous Mathnawi by the Persian poet Nizami Ganjavi (1141–1209). Makhzan ol-Asrar is the first poem collection in the main and best known work of Nizami Ganjavi called Khamsa of Nizami and one of the prominent examples of didactic literature. This Mathnawi has about 2,250 Persian distichs and it was completed at the age of forty of Nizami Ganjavi and since then it has always been considered one of the most important poetic and written works in Persian literature. It starts with this distich: Source: Wikipedia (en)