The gate of Mercy

Your room
Was only a step away from Jerusalem.
You used to say:
You learn how to believe in love
And in the end you cannot hate.
Father. I believed in love.
Yet, I've learned how to hate.
I was in a city without the Gate of Mercy.

Background: the brother alluding to the Gate of Mercy in Jerusalem, and to the concentration camp: a city without the Gate of Mercy. The brother speaks about his father.