Answer:
A device for finding furniture in the dark.
A skin have I, more eyes than one. I can be very nice when I am done.
As destructive as life, As healing as death; An institutioner of strife, Just as prone to bless. It is all that is good, Yet with an evil trend; As it was the beginning of things, It can also be the end.
I am the heart that does not beat. If cut, I bleed without blood. I can fly, but have no wings. I can float, but have no fins. I can sing, but have no mouth.
To cross the water I'm the way, for water I'm above. I touch it not and, truth to say, I neither swim nor move.
What do angels sing in the shower?