There are many Biblical concepts that are not named or laid out in a logical fashion in the Bible. Take the Trinity for example. The word "trinity" is never found in the Bible, but the idea of "God in three persons" is evident all over Scripture (Matthew 3:16-17; 1 Corinthians 12:3-6; 1 Peter 1:2 to name a few). Another one is providence. Unlike trinity, which is a scholarly word, providence is a word used by little old ladies every where. It isn't in most versions of the Bible, but I've come to believe that God really does move in all situations in our lives for our good and, more particularly, the good of those around us, just as he did throughout the Bible.
Take Esther for example. A young Jewish girl, she was chosen to be the Queen of Persia by Ahasuerus the king.