The children of Adam
This couplet is carved above the entrance to the Saadieh and is the most famous thing Saadi wrote — not for its beauty but for its claim: whoever suffers anywhere in the world is a limb of the same body you belong to.
Saadi wrote it in the thirteenth century, after years of travel and captivity. It is the statement of someone who had seen the world, not of someone sitting in a garden wishing.
بنیآدم اعضای یک پیکرند که در آفرینش ز یک گوهرند
چو عضوی به درد آورد روزگار دگر عضوها را نماند قرار
The children of Adam are limbs of one body, created from a single essence. When time afflicts one limb with pain, the other limbs cannot stay at rest.
Source: گلستان، تصحیح فروغی