When people wanted to kill a bear in the ancient times, they hung a heavy log over a bowl of honey. The bear would push the log away in order to eat the honey.

The log would swing back and hit the bear. The bear would become irritated and push the log even harder, and it would return and hit him harder in return. This would continue until the log killed the bear. People behave in the same way when they return evil for the evil they receive from other people. Can’t people be wiser than bears?

– Leo Tolstoy