The Certain Principle of Uncertinity.

He resides in the sail,
He resides in the wind.
He's why you pleasure.
The outcome of thy leisure.

A secret treasure:
In existence his, denies.
In the forgery you find,
The truth of his lies.

The angel and the demon,
Can't together be.
But without them...
Even the shadow of you,
I shall not see.