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The unknown is always interesting.

There are things known and there are things unknown, and in between are the doors of perception.

There are known knowns. These are things we know that we know. There are known unknowns. That is to say, there are things that we know we don't know. But there are also unknown unknowns. There are things we don't know we don't know.

Things that are unknown attract us.

I love the unknown.

Something unknown is doing we don't know what.

The unknown is very scary.

We have an unknown distance yet to run, an unknown river to explore. What falls there are, we know not; what rocks beset the channel, we know not; what walls ride over the river, we know not. Ah, well! we may conjecture many things.

All we know is still infinitely less than all that remains unknown.

To explain the unknown by the known is a logical procedure; to explain the known by the unknown is a form of theological lunacy.