PHILOSOPHER: Certainly, there are times when I feel indignation with regard to social problems. But I would say that rather than a sudden burst of emotion, it is indignation based on logic. There is a difference between personal anger (personal grudge) and indignation with regard to society’s contradictions and injustices (righteous indignation). Personal anger soon cools. Righteous indignation, on the other hand, lasts for a long time. Anger as an expression of a personal grudge is nothing but a tool for making others submit to you.