Quote by Terry Pratchett
There are things so horrible that even the dark is afraid of them. Most people don't know this and this is just as well because the world could not really operate if everyone stayed in bed with the blankets over their head, which is what would happen if people knew what horrors lay a shadow's width away.
Summary
This quote suggests that there exist terrifying forces or events that are so unspeakable that even darkness itself fears them. It implies that most people are unaware of such horrors, and this is for the best since knowing about them may paralyze individuals with fear. The quote implies that if everyone knew the extent of these terrors lurking in the world, people would be too afraid to function, and constantly live in fear and seclusion.