Are There Any Unforgivable Sins In Literature?

Rivka Galchen: “For me, the unforgivable sin in literature is the same as that in life: the assumption of certainty and the moral high ground.”
Benjamin Moser: “The Nazis proved that perverted words can, in fact, lead to the destruction of society. … To use words to serve the cause of human unfreedom is grotesque, like a physician serving torturers.”