If you have the ESV Study Bible, you can save some money by NOT buying Understanding Scripture by Wayne Grudem.
That book is a collection of articles found in the ESV Study Bible. Unless you want it as a separate book for ease of navigation, you can just save your money and get something else instead.
I was going to buy it, but went to Amazon for reviews and the first review I read stated that it was a collection of essays found in the ESV Study Bible. I'm sure glad I read that. Now I can buy some other book instead.
DAL
