Every Christian should read this book! Lane Keister has a helpful digest here.
One Very Important Book
One Response to “One Very Important Book”
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I appeal to you, brothers, to watch out for those who cause divisions and create obstacles contrary to the doctrine that you have been taught; avoid them. For such persons do not serve our Lord Christ, but their own appetites, and by smooth talk and flattery they deceive the hearts of the naïve. (Romans 16:17-18)

Yes, this is a very helpful book.