This statement indicates the struggle between the darkness and the light. The darkness–unregenerate humanity under the influence of Satan, the prince of darkness–has not accepted the light and even resists the light. Thus, “darkness” indicates ignorance and sin, active rejection of God’s will. Those in darkness reject Christ, his light, and his followers. But no matter how deep the darkness, even a small light can drive it back. The power of Christ’s light overcomes any darkness in the world.