Each of us is incomplete compared to someone else - an animal's incomplete compared to a person... and a person compared to God, who is complete only to be imaginary.
He's really sort of the devil. He's completely emotionally detached. He has no empathy. You find that in psychopaths. It's about power with Voldemort. It's an aphrodisiac for him. Power makes him feel alive.
I understood that the will could not be improved before the mind had been enlightened.