As we study the society of 4th Nephi and try to learn what made them the happiest "people among all the people who had been created by the hand of God," it would be impossible not to notice how many times it is pointed out that there was no contention among the people. Verse 15 also teaches us that we can rid ourselves of contention as we fill our hearts with the love of God. Because I have to believe that when all is said and done, the Lord is far less concerned with the way we think than He is with the way we love.