Darkness can cause irrational fear

"Darkness can cause irrational fear – a wolf, a burglar, a
murderer might suddenly appear! But it can also be the cause of a
rational fear – when you can’t see anything, you always run the
danger of bumping into something, of falling and hurting
yourself.
The more their intelligence and wisdom develops, the more people
become not exactly fearful in the usual sense of the word, but
alert. And at the same time their boldness increases too – their
intellectual, mental boldness. They mistrust what comes from
instinct or feeling, for these can cloud their vision, but when
it is a question of something clear and straightforward, they
become bold. This is why truly intelligent and educated people
are bolder than others. They make their way into regions where
most never dare to venture, and it is light that gives them this
boldness."

Omraam Mikhaël Aïvanhov