I have made myself a box.
You can try and find the key,
But I won’t let you open me.
I am safe behind the locks.

I have made myself a stone.
You will never make me break,
No matter what offense I take.
I am strongest on my own.

I have made myself a knife.
If you want my heart, take heed,
Push too hard and you will bleed.
I am fighting for my life.