All these same things are true with regard to studying the theories of the great moral philosophers, living and dead. Learning about these philophsers can be fascinating in its own right and can drive home to us the realization that the problems of normative ethics, and of moral philosophy in general, are deep and difficult, and even thoughtful and brilliant people can disagree abou the answers, And — not surprisingly — studying the writings of moral philosophers is one of the best ways to discover rival moral theories, as well as some of the most interesting and compelling arguments for and against these theories.