By George Dunlap, May 6, 2019. This conversation between Eric Metaxes and Peter Kreeft, Author, Symbol or Substance, on the Eric Metaxes Radio Show, is about the book Symbol or Substance, just released, a possible dialog between. C. S. Lewis, Billy Graham, and Tolkien. It is more than an explanation of what transubstantiation is; it’s a more refined explanation in a dialog form, of the different understandings of what truly (a Catholic truth…) transubstantiation represents in the House of God at the alter. This you tube conversation is more that a conversation about a book, it’s a conversation about why we as Catholics are truly unique in our faith, yet as Christians we all are Blessed in Jesus Christ.