There are so many times that a Bible Concordance comes in handy. The only thing that I wish about a great concordance is that it would be small enough so that I could take it with me everywhere. My Bible has a small one so that on Sunday morning if a topic is hit upon that I would like to know additional information on, I try to use it, but it is usually not large enough. I grew up with one in our house that I could not lift as a child. There are so many cross-references, no pun intended, that are necessary when studying the Bible.