Answer:
"When I found so astonishing a power placed within my hands, I hesitated... concerning the manner in which I should employ it."
Step-by-step explanation:
In the book, it clearly states that he was so excited to finally accomplish what he had been looking to accomplish for so long, but the monster disgusts him and freaks him out at the same time. Therefore, that's why I had come to the conclusion of that being the answer.