How was it that the early Christians, who were but a handful of people, had such a profound impact on the pagan world in which they lived?
It was because they were what they were. It was not their organization, it was the quality of their life, it was the power they possessed because they were truly Christian. That is how Christianity conquered the ancient world, and I am more and more convinced that it is the only way in which Christianity can truly influence the modern world.
The lack of influence of the Christian Church in the world at large today is in my opinion due to one thing only, namely, (God forgive us!) that we are so unlike the description of the Christians that we find in the New Testament.
If therefore we are concerned about the state of the Church, if we have a burden for men and women who are outside the Church, and who in their misery and wretchedness are hurtling themselves to destruction, the first thing we have to do is to examine ourselves, and to discover how closely we conform to this pattern and description.
-Martyn Lloyd Jones, “Saints…and the faithful in Christ Jesus” in God’s Eternal Purpose: An Exposition of Ephesians 1 (p. 24).