You Wouldn't Like Me When I'm Angry

I can see you, my old friend
Built of fire and ice and rage
I can see you and I can feel you
You've served me well these many years
Provided survival through pain
Healing through scars
Warming me like the fire of the sun
Now, amidst the storm in the heart of such a sun
Comes the night. 
Steady, friend
The Dark must come before the dawn
So too, must come the knowledge of the end
You've served me well these many years
Though now such service comes to an end
All balances have been cleared and
All debts are repaid
And so my old friend
I must speed you on your way.