Doctrine

But if any one fact is clear, on the basis of this evidence, it is that the Christian movement at its inception was not just a way of life in the modern sense, but a way of life founded upon a message. It was based, not upon mere feeling, not upon a mere program of work, but upon an account of facts. In other words, it was based upon doctrine.

J. Gresham Machen, Christianity and Liberalism (p.21)