Answer:
"For months I could not rid myself of the phantasm of the cat; and, during this period, there came back into my spirit a half-sentiment that seemed, but was not, remorse."
Step-by-step explanation:
Edgar Allen Poe's short story "The Black Cat" revolves around the unnamed narrator/ protagonist's act of killing his wife which led to his present situation of being in prison. He recounts how he ended up in the state he is in, and how it all happened because of a black cat that he'd taken as a pet.
Even before his wife's death, he had done the act of killing Pluto, his very first pet cat. He was drunk and in a state of sudden frenzy and anger, he not only took out the eye of the cat but also hung it. And soon after, events followed that only he could presume to be related to the wrongful death of Pluto. He admits that "[he] could not rid myself of the phantasm of the cat" which further led to his belief that "there came back into my spirit a half-sentiment that seemed, but was not, remorse".
This admission shows how he felt guilty and how the dead cat represents his guilty conscience.