Calvin,<br><br>Each of the two volumes you have asked about is an abbreviated version of the Systematic Theology; the "Summary" is about 50% less detailed than the "Manual" and the "Manual" is about 50% less than the "Systematic". Each one is also more simplified in the use of technical/theological terms, etc. You might think of them in this way:<br><br>Systematic Theology: High School, College, and Grad School level.<br><br>Manual of Christian Doctrine: High School, Adult Sunday School level.<br><br>Summary of Christian Doctrine: Late Grade School, High School, Mid-Late Teen/Adult Sunday School level.<br><br>I have all three and appreciate them in their intended purposes. [img]http://www.the-highway.com/w3timages/icons/grin.gif" alt="grin" title="grin[/img]<br><br>In His Grace,


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simul iustus et peccator

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