Someone once equated me with beauty

Someone once asked; what is me

What I am, no one knows

And I am not always beautiful.

Nevertheless, I will set you free.

The philosophers say that I do not exist,

But I can kill kings, and I make all men free

I change, but my measure is unchanging

The meaning of forever is until the end of me.

I wait for no man, and I heal all wounds,

But I am often wasted, though to death I hold the key.