Over and over again, no matter how strong darkness seems, light has always prevailed over darkness. Over and over again, no matter how hard darkness tries, the light is always able to overcome the darkness. In fact, darkness cannot put out a light. If the darkness increases until it is black as a cave, it is still not dark enough to extinguish a light. No one has yet smothered a light by increasing the darkness.
Light always overcomes darkness.
We see this in the beginning already. Light overcame darkness. The darkness was deep and black when man first fell into sin. Curse after curse, judgment after judgment, was pronounced by God upon the serpent, upon the woman, upon the man, and even upon the ground. But the darkness was not so deep and so black that there was no light.