Become as Little Children

In Matthew 18:3, Christ says, "Except ye be converted, and become as little children, ye shall not enter into the kingdom of heaven." Interestingly, there is a very similar passage in the Book of Mormon: 3 Nephi 11:38--"ye must repent, and be baptized in my name, and become as a little child, or ye can in nowise inherit the kingdom of God." What do you think that means? In what ways should we become as little children? What would a childlike person be like?

Covenants

I was recently asked to give a talk in church about "making and keeping covenants." I don't know exactly what other Christian churches teach about covenants, but they are central to Mormon theology. What is your understanding about covenants? Does God still make covenants with men, as He did in the Old Testament? What is the "new covenant" Christ speaks of? Why did/does God interact with men through covenants?