This is a famous quote by a great Sicilian writer, Andrea Cammilleri. He is famous to the wide public for being the author, among other works, of novels starring Commissario Montalbano. A television series broadcasted all over the world has been made about this character.
The sentence that invites us to reflect on the other is profound and deserves long reflections. At the same time its simplicity allows a direct interpretation. We are the others, for the others. This should drive us to compassion, guide us to better behavior. Because to love the other, to respect him, means first of all to respect oneself.