Machen on the Necessity of Christian Doctrine: An Explanation of Christianity and Liberalism Chapter 2 (Part 1)

Christianity has always been rooted in both history and doctrine, and without these roots, it becomes something altogether different.
Lessons to Learn from Christianity and Liberalism a Century Later

Few books make more than a passing squeak in the orchestra of Christian history. And some books are so compelling that their deep sound resonates even 100 years later.