Maran Rav Chaim Shmulevitz, zt"l Rosh Yeshivas Mir – Yerushalayim, was fond of quoting the Alter of Navardok, zt"l who said "How beautiful world it would be, if the borrower would pay his loans on time and the lender would never ask for the money. Everybody would live in harmony. The tragedy is that the borrower screams "You are not allowed to bother me" and the lender screams "Repayment of a loan is a Mitzva".
If everyone would be concerned about their own obligations.... the
world would be so harmonious.