"[Many historians of morality,] Mostly Englishmen, … affirm some consensus of the nations, at least of the tame nations, concerning certain principles of morals, and then they infer from this that these principles must be unconditionally binding also for you and me; or, conversely, they see the truth that among different nations moral valuations are necessarily different and then infer from this that no morality is at all binding. Both procedures are equally childish."
January 1, 1970
https://en.wikiquote.org/wiki/Principles