In the latest Dresden Files novel, the Accorded Nations have to face an ancient weapon - the Eye of Balor.
Harry has this slightly confusing conversation with the Queen of Air and Darkness
"The Eye," I said. "It was made of pure hate. I felt that. [...] "It destroyed everything it touched, except you. Why?"
"Why?" Mab’s mouth turned up into a faint smile. "Everyone," she said, "thinks that hate and love are somehow opposite forces. They are not. They are the same force, facing opposite directions." She glanced aside at me. "Love is a fire, my Knight. Love turned the wrong way has killed as many as hate. Reason, young wizard, is the opposite of hate, not love."
Looking at the dictionary, we can find easily that reason is:
the power of the mind to think, understand, and form judgement logically.
So what is Mab trying to say here? That she is very logical? Very intelligent? Understandable? Reasonable?
Why she is indeed cold (for a Queen of Winter it is kind of a job requirement), she is far from being a passionless machine. She is smart, but I wouldn't call her a genius. And as someone who lives in a world where you are either predator or prey, she is DEFINITELY not a understandable person.