Packing Ghostwritten, I had to reread at least a page. And came across another memorable dialogue:

I’m surprised at you. We both know there’s no such thing as love.
What do you call it?
Mutations of wanting.
(…)
But that’s lust. You’re talking about lust, not love.
Lust is the hard sell. Love is the soft sell. The profit margin is exactly the same.
But love’s the opposite of self-interest. True, tender, love is pure and selfless.
No. True, tender love is self-interest so sinewy that it only looks selfless.
I’ve known love-I know love- and it is giving and not taking. We’re not just animals.
We’re only animals.
(…)
We’re talking about love. There is no “why”. That’s the point.
There is always a “why” because there is always something that the beloved wants. Loving somebody means wanting something. Love makes people do selfish, moronic, cruel and inhumane things. To be in love is to be at the mercy of your lover’s desires.