1 Nephi 3:6 - "...thou shalt be favored of the Lord, because thou hast not murmured."
Something I need to remember more often is not to murmur... not just in about the gospel or church, but about life in general. I try to avoid this because I would rather be positive than negative. I have noticed that when I spend time with people who always look at the negative side or who are always complaining, it makes me unhappy. The bad attitude rubs off on me. I start to do the same thing. And that makes me even more unhappy. So if I can avoid murmuring, I'll be happier overall.