"What is the Unpardonable Sin?" asked the lime-burner; and then he shrank farther from his companion, trembling lest his question should be answered. "It is a sin that grew within my own breast," replied Ethan Brand, standing erect with a pride that distinguishes all enthusiasts of his stamp. "A sin that grew nowhere else! The sin of an intellect that triumphed over the sense of brotherhood with man and reverence for God, and sacrificed everything to its own mighty claims!

"Ethan Brand" (1850) from The Snow-Image, and Other Twice-Told Tales (1852)