Is there such a thing as a good Mormon teaching?

A commenter here on black/green-bikini sparked an interesting topic in a recent thread. Here is what they wrote:


 "Many people are raised in the church to expect, or come to the church looking for, rules and certainty - answers from God   that they don't have to think about. And those looking for rules will find them. Some pretty good ones, which we'd all be better off following. But eventually, if one is to grow, one will find that God asks us to live principles, not follow rules."


As you can imagine I disagree. I can't think of a single rule or principle that Mormonism has offered to humankind that would improve a persons life. Sure they say "Do unto others as you would have them do unto you" but what religion/philosophy (bar Satanism etc) doesn't say that?


BUT, I may be forgetting something. I'd love to be reminded. I don't want to only hate on Mormonism. So, the challenge has been set. Teach me a principle/rule that Mormonism has uniquely offered to humankind to improve ones life.