History and Doctrine - J. Gresham Machen

"From the beginning, the Christian gospel, as indeed the name "gospel" or "good news" implies, consisted in an account of something that had happened. And from the beginning, the meaning of the happening was set forth; and when the meaning of the happening was set forth, then there was Christian doctrine. "Christ died"-that is history; "Christ died for our sins"-that is doctrine. Without these two elements, joined in an absolutely indissoluable union, there is no Christianity.

It is perfectly clear, then, that the first Christian missionaries did not simply come forward with an exhortation; they did not say: "Jesus of Nazareth lived a wonderful life of filial piety, and we call upon you our hearers to yield yourselves, as we have done, to the spell of that life." Certainly that is what modern historians would have expected the first Christian missionaries to say, but it must be recognized that as a matter of fact they said nothing of the kind.

...The great weapon with which the disciples of Jesus set out to conquer the world was not a mere comprehension of eternal principles; it was an historical message, an account of something that had recently happened; it was the message, "He is risen." The world was to be redeemed by the proclamation of this event. And with the event went the meaning of the event; and the setting forth of the event with the meaning of the event was doctrine. These two elements are always combined in the Christian message. The narration of the facts is history, the narration of the facts with the meaning of the facts is doctrine. Such was the Christianity of the primitive church."

(Taken from J. Gresham Machen's Christianity and Liberalism [Eerdmans, 1923], pp. 27-29)