The chief dangers to Christianity do not come from the anti-Christian systems. Mohammedanism has never made inroads upon Christianity save by the sword. Nobody fears that Christianity will be swallowed up by Buddhism. It is corrupt forms of Christianity itself which menace from time to time the life of Christianity. Why make much of minor points of difference between those who serve the one Christ? Because a pure gospel is worth preserving; and is not only worth preserving, but is logically (and logic will always work itself out in history) the only saving gospel.
– Benjamin Warfield, 1894, Selected Shorter Writings, vol. 2, p. 665-6.