Riddle of the Sun

I am the one who shares my shimmer with the sea.
Who gives without expecting to take, and in the
Deepest of darks best finds my way. I am what
Moves the waves, decides on your time, your place.

One of infinitely many, but too unique to be by
Another replaced, I have been described a god!
A demon! Above all else! But when I turn away,
Even for a moment... I miss a houndred-thousand deaths.