I read a quote from Ambrose Bierce: "The covers of this book are too far apart" and want to know what book he was talking about.

One he didn’t like!!! ;-)

The quote is from The Devil’s Dictionary so I wonder if it was the Bible.

Actually I stand corrected. The quote is from an unknown book review and is quoted in “Bitter Bierce” by C. H. Grattan.

Here are a few more reviews. I’m not sure they all refer to the same book.

From the moment I picked your book up until I laid it down I was
convulsed with laughter. Someday I intend reading it.
—Groucho Marx

This is not a novel to be tossed aside lightly. It should be thrown with
great force.
—Dorothy Parker

I read part of it all the way through.
—Samuel Goldwyn

Reading this book is like waiting for the first shoe to drop.
—Ralph Novak

Thank you for sending me a copy of your book. I’ll waste no time
reading it.
—Moses Hadas

These reviews are collected in the preface to Laurent W. Marcoux’s An Introduction to Linear Analysis.