The Scarlet Letter by Nathaniel Hawthorne Chapter 13 Page 19

Dimmesdale, on the night of his vigil, had given her a new theme of reflection, and held up to her an object that appeared worthy of any exertion and sacrifice for its attainment.

She had witnessed the intense misery beneath which the minister struggled, or, to speak more accurately, had ceased to struggle. She saw that he stood on the verge of lunacy, if he had not already stepped across it. It was impossible to doubt that, whatever painful efficacy there might be in the secret sting of remorse, a deadlier venom had been infused into it by the hand that proffered relief. A secret enemy had been continually by his side, under the semblance of a friend and helper, and had availed himself of the opportunities thus afforded for tampering with the delicate springs of Mr. Dimmesdale’s nature. Hester could not but ask