Prison or Vault?

My ego is too strong. 
How many times have I tried to kill it? 
It seems like everyday since birth. 
But somehow it keeps waking up, 
Even after every fatal blow it's endured. 

I don't know if it's Immortal or Undead, 
But I know it's not leaving me alone. 
So instead of killing it, 
Why not work with it? 
How much more harm could it do? 

My philosphy is good 
And my ego is smart... 
Enough.
So instead of a prison, 
I should see my ego as a vault.