translation of my favorite spanish poem... 'yo no soy yo' 'i am not i'

I am not I.
I am this one who goes by my side without me seeing him;
whom, sometimes, I go to see,
and whom sometimes I forget.
He that is silent, serene, when I talk,
he that forgives, sweetly, when I hate,
he that walks through places I am not,
he that will remain on his feet when I die.