In chapter 1 of Helaman, verse 33, comes one of my favorite examples of the Godly attribute of covenants. It says, "And it came to pass that Moronihah took possession of the city of Zarahemla again, and cuase that the Lamanites who had been taken prisoners should depart out of the land in peace." This is taking place right after the Lamanites had attacked and destroyed many Nephite homes, in multiple cities. I thought to myself, why would anyone take compassion on the Lamanite prisoners? Why not just keep them there, and then they would have that many fewer people to put on their armies. I decided to look at the crossreference to Alma 44:15 and find out. I remembered that the Lamanites and Nephites had entered into a covenent with one another not to attack the other ever again. However, wouldn't the Lamanites breaking that covenent break it on behalf of the Nephites too? (I scratch your back, you scratch mine type of deal.) It was then that I realized the nobility that Moronihah has by keeping his side of the covenent.
I have always felt that keeping a promise - no matter how casually made - is a God-like attribute. God is always keeping His side of the bargain, even when we screw up, over and over and over again. You word should be a serious thing. People should be able to trust you at no more than that.
Taken from my most recent journal entry for my Book of Mormon 122 class.