"...he who has never seen darkness has never seen the sun."

There is a current prejudice against fogs, and Dickens, perhaps, is their only poet. Considered hygienically, no doubt this may be more or less excusable. But, considered poetically, fog is not undeserving, it has a real significance. We have in our great cities abolished the clean and sane darkness of the country. We have outlawed night and sent her wandering in wild meadows; we have lit eternal watch-fires against her return. We have made a new cosmos, and as a consequence our own sun and stars. And as a consequence also, and most justly, we have made our own darkness. Just as every lamp is a warm human moon, so every fog is a rich human nightfall. If it were not for this mystic accident we should never see darkness, and he who has never seen darkness has never seen the sun. Fog for us is the chief form of that outward pressure which compresses mere luxury into real comfort. It makes the world small, in the same spirit as in that common and happy cry that the world is small, meaning that it is full of friends. The first man that emerges out of the mist with a light, is for us Prometheus, a saviour bringing fire to men. He is that greatest and best of all men, greater than the heroes, better than the saints, Man Friday. Every rumble of a cart, every cry in the distance, marks the heart of humanity beating undaunted in the darkness. It is wholly human; man toiling in his own cloud. If real darkness is like the embrace of God, this is the dark embrace of man.

-Charles Dickens (1906)