Is kindness a sign of strength or weakness?

A kind person is truly strong in spirit, since doing good is not as easy as it seems at first glance. The one who is able to put his own interests in the background is a strong person, because each of us can become an egoist, but not each of us can sacrifice our goals for the good of another person. Many writers have tried to answer the question posed at the beginning of the discussion. In their works, they expressed their point of view, which said that kindness is an indicator of strength.