Ying/Yang (Snakes in paradise)

My paradise guarded, the ying still a virgin
My garden, my heart is held safely within
The walls will not fall, no chaos won't win
The yang gives a bang but the walls don't give in
My spirit inside these, of whiteness and pure
To withstand a tyranny, hardship and war
My walls of cement with an iron beam rib cage
Shall no evil enter when I am deemed this safe
A curse is bestowed unto me when I sleep
My impenetrable fortress has proved to be weak
A snake in the grass comes to wrestle my neck
And sink teeth and ink while I nestle in bed
The white tainted black
My life is attacked
My order's protection is somewhat a lack
To seal off the source: to use evil and sword
To be chaos for order and lay down the law
I am white in the black, I am black in the white
The things I must do to survive through the night