"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."
This is the best statement that draws out the theme of revenge since it is the one where the storyteller is straightforwardly taking steps to hurt another or exact some sort of agony, as a byproduct of the wrong and harm he has endured, it is plainly expressed when he says "you (...) shall curse the sun that gazes on your misery".
The storyteller expects to cause hopelessness with respect to he fears nothing and that makes him powerful.
Thus, this could be the answer.
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