Couplet by Shaikh Saadi(سعدی)

بنی آدم اعضائے یک دگر اند
کہ در آفرینش ز یک جوہرند

چو عضوے بدرد آورد روزگار
دگر عضوہا را نماند قرار

تو کز محنتِ دیگراں بے غمی
نہ شاید کہ نامت نہند آدمی

(گلستانِ سعدی)

Another legend of Persian Poetry “Sheikh Saadi”. I took these above verses from his book called “Gulistan-e-Saadi”.
He talks about human values and right of human beings being treated nicely and duty to treat others nice too.
In above mentioned three verses, he says:

-1- Human being are like organs to each other, and are members of a whole. Because they have been created by one essence and soul.
-2- Thats why if one organ(member) is being hurt at time, the other organs(members) feel the anxietry and  uneasiness because of that pain too.
-3- So, if you are not sympathetic for the pain of the other human beings, you are not worthy of being called the precious title of human being.