Why do you stand by the window
Abandoned to beauty and pride
The thorn of the night in your bosom
The spear of the age in your side
Lost in the rages of fragrance
Lost in the rags of remorse
Lost in the waves of a sickness
That loosens the high silver nerves
Oh chosen love, Oh frozen love
Oh tangle of matter and ghost
Oh darling of angels, demons and saints
Nerves actually  look silver . Metaphorically the silver could refer to strings for musical instrument: loosening as well as tightening is instrumental for tuning a string instrument.
The Window