Well I actually wrote a hub about the unknown. So my hub answers your question in my opinion.
I believe that exploring the unknown is great, provided we are guided by heavenly spirits. God being of the unknown but not known to some (not seen)if you know what I mean, can help us through our journey.
We fear the unknown however the unknown may be the only safe harbour we have in this messed up world. We fear this unknown because we cant see it, or understand it anyway.
The universe/our Creator/God will give us what we want as long as we walk with him, follow the will of God. However we do have free will but we will suffer the consequences that come with that free will. Always
There are evil spirits out there, yes and that is part of the unknown, there is evil masquerading around as "angel of light" and we should beware. However if we fully understand the unknown we can skip the evil that will try to be part of our lives.
As for the "familiar" we use this as our comfort zone, a place we think is safe, a place we live everyday. However there is also evil lurking among the familiar.
Evil among the "familiar" seems easier to spot, but is it really? We will always have temptations in our everyday lives. Once again it is our free will given to us.
Our dreams are part of the "unknown", when we dream we slip into another world, a world of our imagination, however our imagination is stronger than what we perceive as the familiar. We can go many places into the unknown with our imagination. It may hold the key to our eternal life.
So with that said, I would rather reside in the unknown.
have a good day