Persian Poem, Motto of United Nation

One particular poem

written eight centuries ago became a motto and decorates the gate of the United Nations building entrance. Bani Adam, the Children of Adam, is an aphorism calling for the breaking of all barriers and was quoted by President Obama in a meeting with Iranian leaders.
Iranian poet Sa'adi, from the 13th century, is one of the major influential Persian poets of the medieval period. He is recognised in the literary world for the quality of his writing style and in the spiritual realm for the depth of his thoughts.
Sa'adi is best known for his works 'Gulistan' and 'Busan', poetry which emphasised unity in mankind, an interdependence regardless of social barriers and labels. Many of his poems greatly impacted India and had influence throughout central Asia.