The Golestan is written by Saadi Shirazi in 12th century. It is a collection of poems and stories and is widely quoted as a source of wisdom. The book explores virtually every major issue faced by humankind, with both an optimistic and a subtly satirical tone. A very well-known verse of the Golestan (from chapter 1, story 10), is displayed in the entrance of the United Nations Hall of Nations: Human beings are members of a whole, In creation of one essence and soul. If one member is afflicted with pain, Other members uneasy will remain. If you have no sympathy for human pain, The name of human you cannot retain.