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"Shall each man," cried he, "find a wife for his bosom, and each beast have his mate, and I be alone? I had feelings of affection, and they were requited by detestation and scorn. Man! You may hate, but beware! Your hours will pass in dread and misery, and soon the bolt will fall which must ravish from you your happiness forever. Are you to be happy while I grovel in the intensity of my wretchedness? You can blast my other passions, but revenge remains -- revenge, henceforth dearer than light or food! I may die, but first you, my tyrant and tormentor, shall curse the sun that gazes on your misery. Beware, for I am fearless and therefore powerful. I will watch with the wiliness of a snake, that I may sting with its venom. Man, you shall repent of the injuries you inflict." (20.11)
The monster expresses to Victor that he could lose everything if he goes against the monster’s wishes. But Victor remains steadfastly self-sacrificing, realizing that the danger to the world is larger than the danger to himself. He is forced to self-sacrifice to account for his hasty rush into scientific inquiry.