I don't think darkness has to be regarded as representative of evil. There are Patristic references to the unknowable Divine Essence existing in "dazzling darkness." We should regard the interplay of light and dark, like the starry sky, as a beautiful aspect of Gods creation. It's worth noting that God appears as a blinding light in many experiences in the Bible to those unprepared to see him in a sense. But at the Transfiguration the Disciples were able to perceive it in a positive way. Whereas for Paul he was temporarily blinded; he did not behold the Lord because at the time he was unworthy, whereas St. John later in exile on Patmos had a detailed vision which included the New Jerusalem lit by God's glory. But he was able to clearly perceive the details of this city doubtless on account of his preparation through Theosis; he could see through the blinding light.
I love the fog because it obscures things and reminds me of the loving presence of God, and it also feels good in my lungs. Real coastal fog, not smog or smoke. I feel like my own experience of Christianity is a bit like strolling through a blissful, fog covered land from grace-giving Miracle to stunning monument; occasionally I am scared or trip and fall, but then come to a clearing where I can see something beautiful, or see the beauty of God like a lamp or the Sun penetrating the fog.