My most concrete application of this biblical command is in the Confession line. Jesus, through the Church, tells us that grace comes to us through the sacrament, even if sanctifying grace hasn't left the soul through mortal sin. I can't imagine that these others are in need as much as I am. I have always thought this. I guess I have been lucky enough not to run into an enemy in line. So far, it's been an easy assumption. Maybe the bigger challenge is not to hate ourselves as much as we could hate others, at least for some of us.