There is a poem of Saadi written on top of the entrance of the United Nations building, it reads;
The sons of Adam are limbs of each other,
Having been created of one essence.
When the calamity of time affects one limb
The other limbs cannot remain at rest.
If you have no sympathy for the troubles of others,
You are unworthy to be called by the name of a Human.
In Persian Language;
Bani aadam aazaye yek digarand
ke dar aafarinesh ze yek gooharand
cho ozvi be dard aavarad roozegaar
degar ozvhaa raa namaanad gharaar
to kaz mehnate digaraan bi ghami
nashaayad ke naamat nahand aadami