Which theme is clearly evident in these lines from the passage?

Why, sir, I've been so hungry that I have been glad to take the bones they threw to their dogs; and yet, when I was a little fellow, and laid awake whole nights and cried, it wasn't the hunger, it wasn't the whipping, I cried for. No, sir, it was for my mother and my sisters,—it was because I hadn't a friend to love me on earth.

gratitude

piety

liberation

suffering