The Kingdom of God is Within You by Leo Tolstoy Chapter 8 Page 16

for eighteen centuries, and at last reached the present position in which it is absolutely obvious that there is, and can be, no external definition of evil binding upon all. Men have come to the point of ceasing to believe in the possibility or even desirability of finding and establishing such a general definition. It has come to men in power ceasing to attempt to prove that what they regard as evil is evil, and simply declaring that they regard as evil what they don't like, while their subjects no longer obey them because they accept the definition of evil laid down by them, but simply obey because they cannot help themselves.

It was not because it was a good thing, necessary and beneficial to men, and the contrary course would have been an evil, but simply because it was the will of those in power that Nice was