Excerpts of the President's News Conference
I shall take the oath of office tomorrow on a Bible that was given to me by my grandmother. That was the family Bible to which I referred the other day. Someone wrote in and wanted to furnish a Bible that George Washington had used, and I wrote thanking them and saying I had this family Bible and preferred to use that. It will be opened at the first chapter of John, which happens to be the first chapter of the Bible that I can recall reading. My grandfather was ill for a long time before he passed away and I used to read that chapter of the Bible to him when I was a small boy not more than four or five years old.
Source: "The Talkative President: The Off-the-Record Press Conferences of Calvin Coolidge". eds. Howard H. Quint & Robert H. Ferrell. The University Massachusetts Press. 1964.
Calvin Coolidge, Excerpts of the President's News Conference Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/349098