I own hard copy of Bible Doctrine: Essential Teachings of the Christian Faith
It says in the preface
“Condensed version of … Systematic theology”
The preface in the second edition is very good, btw. Here is the relevant part to your question:
I am grateful to God for the widespread ministry of the first edition of this book (1994). The book so far has been translated into nineteen languages, with more translations in process. In addition, Jeff Purswell prepared a 528-page condensation of this book, Bible Doctrine, and my son Elliot further condensed that into a 159-page book, Christian Beliefs. Finally, Erik Thoennes prepared a further condensation for a 6-page laminated study guide.5 With God’s blessing, these shorter publications have also proved helpful to many people and churches.
Two other volumes have directly supplemented the material in this book. I have found immensely helpful the chapter-by-chapter historical surveys for these same doctrines that are found in Gregg Allison’s Historical Theology: An Introduction to Christian Doctrine; A Companion to Wayne Grudem’s Systematic Theology. And Erik Thoennes and Brianna Smith have compiled a new companion volume, Systematic Theology Workbook, which contains study questions and practical exercises to help in learning the material in each chapter.
I commit this second edition into the Lord’s hands, asking that he may use it to inform and strengthen the faith of those who read it and to deepen their personal relationship with him.
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