79. A soul which knows that it is loved, but does not itself love, betrays its sediment: its dregs come up.
Self-Defeating Behavior. See also: the Underground Man. However, given how inward-turned N is, it probably references his failed relationship with Lou Salomé, who didn't love him back. He loved her, and when she didn't love him, he saw her 'sediment.'
He does not otherwise seem like a very good source for advice on love. Still, even if he doesn't mean it, he might have said something that can be taken out of context and used.
