His mind was the result of many centuries of careful cultivation in a carefully constructed Christian culture through carefully contracted marriages and the careful raising of godly children. Thus he had a great mental capacity for absorbing the knowledge out of books and remembering everything he read. Then, guided by the presuppositional philosophy (i.e., sola Scriptura) of Cornelius Van Til, he read tens of thousands of books in the light of Scripture, distilling them down to a few lessons per week over a lifetime. These became Pocket College.
