Indignation is hatred towards one who has done evil to another.
 Baruch Spinoza, Ethics (1677). copy citation

add
Author Baruch Spinoza
Source Ethics
Topic evil indignation
Date 1677
Language English
Reference
Note Translated by R. H. M. Elwes
Weblink http://www.gutenberg.org/files/3800/3800-h/3800-h.htm

Context

“there seems to be no difference, unless perhaps that the former term is used in reference to a particular action, and the latter in reference to a disposition. XIX. Approval is love towards one who has done good to another. XX. Indignation is hatred towards one who has done evil to another. Explanation—I am aware that these terms are employed in senses somewhat different from those usually assigned. But my purpose is to explain, not the meaning of words, but the nature of things. I therefore make use of such terms, as may convey my meaning without any violent departure from their ordinary signification.” source