I'm re-reading The Two Towers and was struck by this exchange between the future king and Eomer when they first meet:
Eomer: It is hard to be sure of anything among so many marvels. The world is all grown strange... How shall a man judge what to do in such times?
Aragorn: As he ever has judged. Good and ill have not changed since yesteryear; nor are they one thing among Elves and Dwarves and another among Men. it is a man's part to discern them...
Right on Aragorn... I mean Professor Tolkien!