"He is someone who knows, from the very beginning, what a good
explanation is. Nobody taught him this. He simply knows. He loves it
when an explanation fits firmly into place, leaving no space at all.
When he understands why something is the way it is, why it has to be
that way, the knowing feels like pleasure to him, like a laughing in his
mind. And when explanations are bad, he feels it almost like a physical
pain, like some small animal gnawing at his chest."
Rebecca Goldstein, Betraying Spinoza.