I need a dictionary for 5 year olds

Sydney was trying to learn a new song that we sang at church service last Sunday. We kept practicing until she could sing, "Humble yourself in the sight of the Lord". Then I get the question that I knew would come soon. "Mom, what does humble mean"? I looked to Paul for help in how to answer but he was grinning so much that he was useless. So I gave what I thought would be a good answer:

Me: It means that you don't think that you are better than other people.
Sydney: But I am better, I'm a good little girl.

At least she doesn't lack self confidence.